Public bug reported:

Installing w3c-markup-validator rendered the Apache2 to fail to start; problems 
related to webworkk2 install.  Please see details below.
# apt install w3-recs w3c-linkchecker w3c-markup-validator
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages were automatically installed and are no longer required:
  libllvm10:i386 linux-headers-5.4.0-52 linux-headers-5.4.0-52-generic 
linux-headers-5.4.0-54 linux-headers-5.4.0-54-generic linux-headers-5.4.0-58
  linux-headers-5.4.0-58-generic linux-image-5.4.0-52-generic 
linux-image-5.4.0-54-generic linux-image-5.4.0-58-generic 
linux-modules-5.4.0-52-generic
  linux-modules-5.4.0-54-generic linux-modules-5.4.0-58-generic 
linux-modules-extra-5.4.0-52-generic linux-modules-extra-5.4.0-54-generic
  linux-modules-extra-5.4.0-58-generic
Use 'apt autoremove' to remove them.
The following additional packages will be installed:
  libcss-dom-perl libencode-hanextra-perl libencode-jis2k-perl 
libhtml-encoding-perl libhtml-tidy-perl liblocale-codes-perl libosp5 
libset-intspan-perl
  libsgml-parser-opensp-perl libterm-readkey-perl libtidy5deb1 w3c-sgml-lib
Suggested packages:
  libwebservice-validator-html-w3c-perl libtest-html-w3c-perl
The following NEW packages will be installed:
  libcss-dom-perl libencode-hanextra-perl libencode-jis2k-perl 
libhtml-encoding-perl libhtml-tidy-perl liblocale-codes-perl libosp5 
libset-intspan-perl
  libsgml-parser-opensp-perl libterm-readkey-perl libtidy5deb1 w3-recs 
w3c-linkchecker w3c-markup-validator w3c-sgml-lib
0 upgraded, 15 newly installed, 0 to remove and 0 not upgraded.
Need to get 37.7 MB of archives.
After this operation, 225 MB of additional disk space will be used.
Do you want to continue? [Y/n]
Get:1 http://ph.archive.ubuntu.com/ubuntu focal/universe amd64 libcss-dom-perl 
all 0.17-1 [107 kB]
Get:2 http://ph.archive.ubuntu.com/ubuntu focal/universe amd64 
libencode-hanextra-perl amd64 0.23-5build2 [1,493 kB]
Get:3 http://ph.archive.ubuntu.com/ubuntu focal/universe amd64 
libencode-jis2k-perl amd64 0.03-1build5 [305 kB]
Get:4 http://ph.archive.ubuntu.com/ubuntu focal/universe amd64 
libhtml-encoding-perl all 0.61-2 [19.1 kB]
Get:5 http://ph.archive.ubuntu.com/ubuntu focal/main amd64 libtidy5deb1 amd64 
2:5.6.0-11 [203 kB]
Get:6 http://ph.archive.ubuntu.com/ubuntu focal/universe amd64 
libhtml-tidy-perl amd64 1.60-4build1 [20.3 kB]
Get:7 http://ph.archive.ubuntu.com/ubuntu focal/universe amd64 
liblocale-codes-perl all 3.62-1 [246 kB]
Get:8 http://ph.archive.ubuntu.com/ubuntu focal/universe amd64 libosp5 amd64 
1.5.2-13ubuntu3 [652 kB]
Get:9 http://ph.archive.ubuntu.com/ubuntu focal/universe amd64 
libset-intspan-perl all 1.19-1 [27.8 kB]
Get:10 http://ph.archive.ubuntu.com/ubuntu focal/universe amd64 
libsgml-parser-opensp-perl amd64 0.994-3build7 [47.6 kB]
Get:11 http://ph.archive.ubuntu.com/ubuntu focal/main amd64 
libterm-readkey-perl amd64 2.38-1build1 [24.6 kB]
Get:12 http://ph.archive.ubuntu.com/ubuntu focal/multiverse amd64 w3-recs all 
20110107-1 [32.4 MB]
Get:13 http://ph.archive.ubuntu.com/ubuntu focal/universe amd64 w3c-linkchecker 
all 4.81-10 [57.3 kB]
Get:14 http://ph.archive.ubuntu.com/ubuntu focal/universe amd64 w3c-sgml-lib 
all 1.3-2 [277 kB]
Get:15 http://ph.archive.ubuntu.com/ubuntu focal/universe amd64 
w3c-markup-validator all 1.3+dfsg-4 [1,784 kB]
Fetched 37.7 MB in 37s (1,022 kB/s)
Preconfiguring packages ...
Selecting previously unselected package libcss-dom-perl.
(Reading database ... 722766 files and directories currently installed.)
Preparing to unpack .../00-libcss-dom-perl_0.17-1_all.deb ...
Unpacking libcss-dom-perl (0.17-1) ...
Selecting previously unselected package libencode-hanextra-perl.
Preparing to unpack .../01-libencode-hanextra-perl_0.23-5build2_amd64.deb ...
Unpacking libencode-hanextra-perl (0.23-5build2) ...
Selecting previously unselected package libencode-jis2k-perl.
Preparing to unpack .../02-libencode-jis2k-perl_0.03-1build5_amd64.deb ...
Unpacking libencode-jis2k-perl (0.03-1build5) ...
Selecting previously unselected package libhtml-encoding-perl.
Preparing to unpack .../03-libhtml-encoding-perl_0.61-2_all.deb ...
Unpacking libhtml-encoding-perl (0.61-2) ...
Selecting previously unselected package libtidy5deb1:amd64.
Preparing to unpack .../04-libtidy5deb1_2%3a5.6.0-11_amd64.deb ...
Unpacking libtidy5deb1:amd64 (2:5.6.0-11) ...
Selecting previously unselected package libhtml-tidy-perl.
Preparing to unpack .../05-libhtml-tidy-perl_1.60-4build1_amd64.deb ...
Unpacking libhtml-tidy-perl (1.60-4build1) ...
Selecting previously unselected package liblocale-codes-perl.
Preparing to unpack .../06-liblocale-codes-perl_3.62-1_all.deb ...
Unpacking liblocale-codes-perl (3.62-1) ...
Selecting previously unselected package libosp5.
Preparing to unpack .../07-libosp5_1.5.2-13ubuntu3_amd64.deb ...
Unpacking libosp5 (1.5.2-13ubuntu3) ...
Selecting previously unselected package libset-intspan-perl.
Preparing to unpack .../08-libset-intspan-perl_1.19-1_all.deb ...
Unpacking libset-intspan-perl (1.19-1) ...
Selecting previously unselected package libsgml-parser-opensp-perl.
Preparing to unpack .../09-libsgml-parser-opensp-perl_0.994-3build7_amd64.deb 
...
Unpacking libsgml-parser-opensp-perl (0.994-3build7) ...
Selecting previously unselected package libterm-readkey-perl.
Preparing to unpack .../10-libterm-readkey-perl_2.38-1build1_amd64.deb ...
Unpacking libterm-readkey-perl (2.38-1build1) ...
Selecting previously unselected package w3-recs.
Preparing to unpack .../11-w3-recs_20110107-1_all.deb ...
Unpacking w3-recs (20110107-1) ...
Selecting previously unselected package w3c-linkchecker.
Preparing to unpack .../12-w3c-linkchecker_4.81-10_all.deb ...
Unpacking w3c-linkchecker (4.81-10) ...
Selecting previously unselected package w3c-sgml-lib.
Preparing to unpack .../13-w3c-sgml-lib_1.3-2_all.deb ...
Unpacking w3c-sgml-lib (1.3-2) ...
Selecting previously unselected package w3c-markup-validator.
Preparing to unpack .../14-w3c-markup-validator_1.3+dfsg-4_all.deb ...
Unpacking w3c-markup-validator (1.3+dfsg-4) ...
Setting up libencode-jis2k-perl (0.03-1build5) ...
Setting up libcss-dom-perl (0.17-1) ...
Setting up w3c-sgml-lib (1.3-2) ...
Setting up libset-intspan-perl (1.19-1) ...
Setting up w3-recs (20110107-1) ...
Setting up libosp5 (1.5.2-13ubuntu3) ...
Setting up libhtml-encoding-perl (0.61-2) ...
Setting up liblocale-codes-perl (3.62-1) ...
Setting up libsgml-parser-opensp-perl (0.994-3build7) ...
Setting up libencode-hanextra-perl (0.23-5build2) ...
Setting up libterm-readkey-perl (2.38-1build1) ...
Setting up libtidy5deb1:amd64 (2:5.6.0-11) ...
Setting up w3c-linkchecker (4.81-10) ...

Creating config file /etc/w3c/checklink.conf with new version
apache2_invoke: Enable configuration w3c-linkchecker
Setting up libhtml-tidy-perl (1.60-4build1) ...
Processing triggers for sgml-base (1.29.1) ...
Processing triggers for doc-base (0.10.9) ...
Processing 198 added doc-base files...
Registering documents with dwww...
Processing triggers for libc-bin (2.31-0ubuntu9.1) ...
Processing triggers for man-db (2.9.1-1) ...
Setting up w3c-markup-validator (1.3+dfsg-4) ...
apache2_invoke rewrite: no action - module was disabled by local admin
apache2_invoke: Enable configuration w3c-markup-validator
apache2_reload: Your configuration is broken. Not reloading Apache 2
apache2_reload: (in cleanup) Can't use an undefined value as a symbol reference 
at /opt/webwork/webwork2/lib/WeBWorK/CourseEnvironment.pm line 180.
apache2_reload: AH00526: Syntax error on line 192 of 
/etc/apache2/conf-enabled/webwork.conf:
apache2_reload: Can't locate PGUtil.pm in @INC (you may need to install the 
PGUtil module) (@INC contains: /opt/webwork/webwork2/lib /etc/perl 
/usr/local/lib/x86_64-linux-gnu/perl/5.30.0 /usr/local/share/perl/5.30.0 
/usr/lib/x86_64-linux-gnu/perl5/5.30 /usr/share/perl5 
/usr/lib/x86_64-linux-gnu/perl/5.30 /usr/share/perl/5.30 
/usr/local/lib/site_perl /etc/apache2) at 
/opt/webwork/webwork2/lib/WeBWorK/Utils/CourseManagement.pm line 39.nBEGIN 
failed--compilation aborted at 
/opt/webwork/webwork2/lib/WeBWorK/Utils/CourseManagement.pm line 
39.nCompilation failed in require at /opt/webwork/webwork2/lib/WebworkSOAP.pm 
line 6.nBEGIN failed--compilation aborted at 
/opt/webwork/webwork2/lib/WebworkSOAP.pm line 6.nCompilation failed in require 
at (eval 252) line 1.n

Uninstalling w3c-markup-validator does fix the problem. :D
Hoping this will help. <3

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: w3c-markup-validator 1.3+dfsg-4
ProcVersionSignature: Ubuntu 5.8.0-40.45~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-40-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.14
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: LXQt
Date: Fri Jan 22 11:16:43 2021
InstallationDate: Installed on 2020-07-13 (192 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
PackageArchitecture: all
SourcePackage: w3c-markup-validator
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: w3c-markup-validator (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

** Description changed:

  Installing w3c-markup-validator rendered the Apache2 to fail to start; 
problems related to webworkk2 install.  Please see details below.
  # apt install w3-recs w3c-linkchecker w3c-markup-validator
  Reading package lists... Done
- Building dependency tree       
+ Building dependency tree
  Reading state information... Done
  The following packages were automatically installed and are no longer 
required:
-   libllvm10:i386 linux-headers-5.4.0-52 linux-headers-5.4.0-52-generic 
linux-headers-5.4.0-54 linux-headers-5.4.0-54-generic linux-headers-5.4.0-58
-   linux-headers-5.4.0-58-generic linux-image-5.4.0-52-generic 
linux-image-5.4.0-54-generic linux-image-5.4.0-58-generic 
linux-modules-5.4.0-52-generic
-   linux-modules-5.4.0-54-generic linux-modules-5.4.0-58-generic 
linux-modules-extra-5.4.0-52-generic linux-modules-extra-5.4.0-54-generic
-   linux-modules-extra-5.4.0-58-generic
+   libllvm10:i386 linux-headers-5.4.0-52 linux-headers-5.4.0-52-generic 
linux-headers-5.4.0-54 linux-headers-5.4.0-54-generic linux-headers-5.4.0-58
+   linux-headers-5.4.0-58-generic linux-image-5.4.0-52-generic 
linux-image-5.4.0-54-generic linux-image-5.4.0-58-generic 
linux-modules-5.4.0-52-generic
+   linux-modules-5.4.0-54-generic linux-modules-5.4.0-58-generic 
linux-modules-extra-5.4.0-52-generic linux-modules-extra-5.4.0-54-generic
+   linux-modules-extra-5.4.0-58-generic
  Use 'apt autoremove' to remove them.
  The following additional packages will be installed:
-   libcss-dom-perl libencode-hanextra-perl libencode-jis2k-perl 
libhtml-encoding-perl libhtml-tidy-perl liblocale-codes-perl libosp5 
libset-intspan-perl
-   libsgml-parser-opensp-perl libterm-readkey-perl libtidy5deb1 w3c-sgml-lib
+   libcss-dom-perl libencode-hanextra-perl libencode-jis2k-perl 
libhtml-encoding-perl libhtml-tidy-perl liblocale-codes-perl libosp5 
libset-intspan-perl
+   libsgml-parser-opensp-perl libterm-readkey-perl libtidy5deb1 w3c-sgml-lib
  Suggested packages:
-   libwebservice-validator-html-w3c-perl libtest-html-w3c-perl
+   libwebservice-validator-html-w3c-perl libtest-html-w3c-perl
  The following NEW packages will be installed:
-   libcss-dom-perl libencode-hanextra-perl libencode-jis2k-perl 
libhtml-encoding-perl libhtml-tidy-perl liblocale-codes-perl libosp5 
libset-intspan-perl
-   libsgml-parser-opensp-perl libterm-readkey-perl libtidy5deb1 w3-recs 
w3c-linkchecker w3c-markup-validator w3c-sgml-lib
+   libcss-dom-perl libencode-hanextra-perl libencode-jis2k-perl 
libhtml-encoding-perl libhtml-tidy-perl liblocale-codes-perl libosp5 
libset-intspan-perl
+   libsgml-parser-opensp-perl libterm-readkey-perl libtidy5deb1 w3-recs 
w3c-linkchecker w3c-markup-validator w3c-sgml-lib
  0 upgraded, 15 newly installed, 0 to remove and 0 not upgraded.
  Need to get 37.7 MB of archives.
  After this operation, 225 MB of additional disk space will be used.
- Do you want to continue? [Y/n] 
+ Do you want to continue? [Y/n]
  Get:1 http://ph.archive.ubuntu.com/ubuntu focal/universe amd64 
libcss-dom-perl all 0.17-1 [107 kB]
  Get:2 http://ph.archive.ubuntu.com/ubuntu focal/universe amd64 
libencode-hanextra-perl amd64 0.23-5build2 [1,493 kB]
  Get:3 http://ph.archive.ubuntu.com/ubuntu focal/universe amd64 
libencode-jis2k-perl amd64 0.03-1build5 [305 kB]
  Get:4 http://ph.archive.ubuntu.com/ubuntu focal/universe amd64 
libhtml-encoding-perl all 0.61-2 [19.1 kB]
  Get:5 http://ph.archive.ubuntu.com/ubuntu focal/main amd64 libtidy5deb1 amd64 
2:5.6.0-11 [203 kB]
  Get:6 http://ph.archive.ubuntu.com/ubuntu focal/universe amd64 
libhtml-tidy-perl amd64 1.60-4build1 [20.3 kB]
  Get:7 http://ph.archive.ubuntu.com/ubuntu focal/universe amd64 
liblocale-codes-perl all 3.62-1 [246 kB]
  Get:8 http://ph.archive.ubuntu.com/ubuntu focal/universe amd64 libosp5 amd64 
1.5.2-13ubuntu3 [652 kB]
  Get:9 http://ph.archive.ubuntu.com/ubuntu focal/universe amd64 
libset-intspan-perl all 1.19-1 [27.8 kB]
  Get:10 http://ph.archive.ubuntu.com/ubuntu focal/universe amd64 
libsgml-parser-opensp-perl amd64 0.994-3build7 [47.6 kB]
  Get:11 http://ph.archive.ubuntu.com/ubuntu focal/main amd64 
libterm-readkey-perl amd64 2.38-1build1 [24.6 kB]
  Get:12 http://ph.archive.ubuntu.com/ubuntu focal/multiverse amd64 w3-recs all 
20110107-1 [32.4 MB]
- Get:13 http://ph.archive.ubuntu.com/ubuntu focal/universe amd64 
w3c-linkchecker all 4.81-10 [57.3 kB]                                           
                            
- Get:14 http://ph.archive.ubuntu.com/ubuntu focal/universe amd64 w3c-sgml-lib 
all 1.3-2 [277 kB]                                                              
               
- Get:15 http://ph.archive.ubuntu.com/ubuntu focal/universe amd64 
w3c-markup-validator all 1.3+dfsg-4 [1,784 kB]                                  
                            
- Fetched 37.7 MB in 37s (1,022 kB/s)                                           
                                                                                
              
+ Get:13 http://ph.archive.ubuntu.com/ubuntu focal/universe amd64 
w3c-linkchecker all 4.81-10 [57.3 kB]
+ Get:14 http://ph.archive.ubuntu.com/ubuntu focal/universe amd64 w3c-sgml-lib 
all 1.3-2 [277 kB]
+ Get:15 http://ph.archive.ubuntu.com/ubuntu focal/universe amd64 
w3c-markup-validator all 1.3+dfsg-4 [1,784 kB]
+ Fetched 37.7 MB in 37s (1,022 kB/s)
  Preconfiguring packages ...
  Selecting previously unselected package libcss-dom-perl.
  (Reading database ... 722766 files and directories currently installed.)
  Preparing to unpack .../00-libcss-dom-perl_0.17-1_all.deb ...
  Unpacking libcss-dom-perl (0.17-1) ...
  Selecting previously unselected package libencode-hanextra-perl.
  Preparing to unpack .../01-libencode-hanextra-perl_0.23-5build2_amd64.deb ...
  Unpacking libencode-hanextra-perl (0.23-5build2) ...
  Selecting previously unselected package libencode-jis2k-perl.
  Preparing to unpack .../02-libencode-jis2k-perl_0.03-1build5_amd64.deb ...
  Unpacking libencode-jis2k-perl (0.03-1build5) ...
  Selecting previously unselected package libhtml-encoding-perl.
  Preparing to unpack .../03-libhtml-encoding-perl_0.61-2_all.deb ...
  Unpacking libhtml-encoding-perl (0.61-2) ...
  Selecting previously unselected package libtidy5deb1:amd64.
  Preparing to unpack .../04-libtidy5deb1_2%3a5.6.0-11_amd64.deb ...
  Unpacking libtidy5deb1:amd64 (2:5.6.0-11) ...
  Selecting previously unselected package libhtml-tidy-perl.
  Preparing to unpack .../05-libhtml-tidy-perl_1.60-4build1_amd64.deb ...
  Unpacking libhtml-tidy-perl (1.60-4build1) ...
  Selecting previously unselected package liblocale-codes-perl.
  Preparing to unpack .../06-liblocale-codes-perl_3.62-1_all.deb ...
  Unpacking liblocale-codes-perl (3.62-1) ...
  Selecting previously unselected package libosp5.
  Preparing to unpack .../07-libosp5_1.5.2-13ubuntu3_amd64.deb ...
  Unpacking libosp5 (1.5.2-13ubuntu3) ...
  Selecting previously unselected package libset-intspan-perl.
  Preparing to unpack .../08-libset-intspan-perl_1.19-1_all.deb ...
  Unpacking libset-intspan-perl (1.19-1) ...
  Selecting previously unselected package libsgml-parser-opensp-perl.
  Preparing to unpack .../09-libsgml-parser-opensp-perl_0.994-3build7_amd64.deb 
...
  Unpacking libsgml-parser-opensp-perl (0.994-3build7) ...
  Selecting previously unselected package libterm-readkey-perl.
  Preparing to unpack .../10-libterm-readkey-perl_2.38-1build1_amd64.deb ...
  Unpacking libterm-readkey-perl (2.38-1build1) ...
  Selecting previously unselected package w3-recs.
  Preparing to unpack .../11-w3-recs_20110107-1_all.deb ...
  Unpacking w3-recs (20110107-1) ...
  Selecting previously unselected package w3c-linkchecker.
  Preparing to unpack .../12-w3c-linkchecker_4.81-10_all.deb ...
  Unpacking w3c-linkchecker (4.81-10) ...
  Selecting previously unselected package w3c-sgml-lib.
  Preparing to unpack .../13-w3c-sgml-lib_1.3-2_all.deb ...
  Unpacking w3c-sgml-lib (1.3-2) ...
  Selecting previously unselected package w3c-markup-validator.
  Preparing to unpack .../14-w3c-markup-validator_1.3+dfsg-4_all.deb ...
  Unpacking w3c-markup-validator (1.3+dfsg-4) ...
  Setting up libencode-jis2k-perl (0.03-1build5) ...
  Setting up libcss-dom-perl (0.17-1) ...
  Setting up w3c-sgml-lib (1.3-2) ...
  Setting up libset-intspan-perl (1.19-1) ...
  Setting up w3-recs (20110107-1) ...
  Setting up libosp5 (1.5.2-13ubuntu3) ...
  Setting up libhtml-encoding-perl (0.61-2) ...
  Setting up liblocale-codes-perl (3.62-1) ...
  Setting up libsgml-parser-opensp-perl (0.994-3build7) ...
  Setting up libencode-hanextra-perl (0.23-5build2) ...
  Setting up libterm-readkey-perl (2.38-1build1) ...
  Setting up libtidy5deb1:amd64 (2:5.6.0-11) ...
  Setting up w3c-linkchecker (4.81-10) ...
  
  Creating config file /etc/w3c/checklink.conf with new version
  apache2_invoke: Enable configuration w3c-linkchecker
  Setting up libhtml-tidy-perl (1.60-4build1) ...
  Processing triggers for sgml-base (1.29.1) ...
  Processing triggers for doc-base (0.10.9) ...
  Processing 198 added doc-base files...
  Registering documents with dwww...
  Processing triggers for libc-bin (2.31-0ubuntu9.1) ...
  Processing triggers for man-db (2.9.1-1) ...
  Setting up w3c-markup-validator (1.3+dfsg-4) ...
  apache2_invoke rewrite: no action - module was disabled by local admin
  apache2_invoke: Enable configuration w3c-markup-validator
  apache2_reload: Your configuration is broken. Not reloading Apache 2
  apache2_reload: (in cleanup) Can't use an undefined value as a symbol 
reference at /opt/webwork/webwork2/lib/WeBWorK/CourseEnvironment.pm line 180.
  apache2_reload: AH00526: Syntax error on line 192 of 
/etc/apache2/conf-enabled/webwork.conf:
  apache2_reload: Can't locate PGUtil.pm in @INC (you may need to install the 
PGUtil module) (@INC contains: /opt/webwork/webwork2/lib /etc/perl 
/usr/local/lib/x86_64-linux-gnu/perl/5.30.0 /usr/local/share/perl/5.30.0 
/usr/lib/x86_64-linux-gnu/perl5/5.30 /usr/share/perl5 
/usr/lib/x86_64-linux-gnu/perl/5.30 /usr/share/perl/5.30 
/usr/local/lib/site_perl /etc/apache2) at 
/opt/webwork/webwork2/lib/WeBWorK/Utils/CourseManagement.pm line 39.nBEGIN 
failed--compilation aborted at 
/opt/webwork/webwork2/lib/WeBWorK/Utils/CourseManagement.pm line 
39.nCompilation failed in require at /opt/webwork/webwork2/lib/WebworkSOAP.pm 
line 6.nBEGIN failed--compilation aborted at 
/opt/webwork/webwork2/lib/WebworkSOAP.pm line 6.nCompilation failed in require 
at (eval 252) line 1.n
  
- Hoping this will help.
+ Uninstalling w3c-markup-validator does fix the problem. :D
+ Hoping this will help. <3
  
  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: w3c-markup-validator 1.3+dfsg-4
  ProcVersionSignature: Ubuntu 5.8.0-40.45~20.04.1-generic 5.8.18
  Uname: Linux 5.8.0-40-generic x86_64
  ApportVersion: 2.20.11-0ubuntu27.14
  Architecture: amd64
  CasperMD5CheckResult: skip
  CurrentDesktop: LXQt
  Date: Fri Jan 22 11:16:43 2021
  InstallationDate: Installed on 2020-07-13 (192 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
  PackageArchitecture: all
  SourcePackage: w3c-markup-validator
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/1912710

Title:
  install interferes with WeBWorK 2.15 install; Apache2 fails to start

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