Note that dpkg and apt need to go first, then we can add support to
other tools. The solution is not entirely optimal (at least
theoretically): Crashing the frontend releases the frontend lock, so
other frontends could start doing stuff (though probably fail at dpkg
lock). It would have been nice to be able to have dpkg inherit the lock
from apt, but that was sadly not possible with our locking approach.

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https://bugs.launchpad.net/bugs/1760979

Title:
  apt-get dist-upgrade failed

Status in apt package in Ubuntu:
  Triaged
Status in dpkg package in Ubuntu:
  Triaged
Status in packagekit package in Ubuntu:
  Triaged
Status in python-apt package in Ubuntu:
  Triaged

Bug description:
  Hello, something went amiss with a recent apt-get -u dist-upgrade:

  root@wopr:~# apt-get update && apt-get -u dist-upgrade
  Get:1 file:/srv/mirror/ubuntu xenial InRelease [247 kB]
  Get:1 file:/srv/mirror/ubuntu xenial InRelease [247 kB]
  Get:2 file:/srv/mirror/ubuntu xenial-updates InRelease [102 kB]               
   
  Get:2 file:/srv/mirror/ubuntu xenial-updates InRelease [102 kB]               
        
  Get:3 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB]    
                                  
  Get:4 file:/srv/mirror/ubuntu xenial-updates/main Sources [302 kB]            
 
  Get:5 file:/srv/mirror/ubuntu xenial-updates/universe Sources [199 kB]
  Get:6 file:/srv/mirror/ubuntu xenial-updates/main amd64 Packages [746 kB]
  Get:7 file:/srv/mirror/ubuntu xenial-updates/main i386 Packages [691 kB]
  Get:8 file:/srv/mirror/ubuntu xenial-updates/main Translation-en [309 kB]
  Get:9 file:/srv/mirror/ubuntu xenial-updates/universe amd64 Packages [616 kB]
  Get:10 file:/srv/mirror/ubuntu xenial-updates/universe i386 Packages [570 kB]
  Get:11 file:/srv/mirror/ubuntu xenial-updates/universe Translation-en [248 kB]
  Get:12 http://security.ubuntu.com/ubuntu xenial-security/main Sources [119 kB]
  Get:13 http://security.ubuntu.com/ubuntu xenial-security/universe Sources 
[62.4 kB]
  Get:14 http://security.ubuntu.com/ubuntu xenial-security/main amd64 Packages 
[467 kB]
  Get:15 http://security.ubuntu.com/ubuntu xenial-security/main i386 Packages 
[421 kB]
  Get:16 http://security.ubuntu.com/ubuntu xenial-security/main Translation-en 
[201 kB]
  Get:17 http://security.ubuntu.com/ubuntu xenial-security/universe amd64 
Packages [340 kB]
  Get:18 http://security.ubuntu.com/ubuntu xenial-security/universe i386 
Packages [296 kB]
  Get:19 http://security.ubuntu.com/ubuntu xenial-security/universe 
Translation-en [126 kB]
  Fetched 2,135 kB in 1s (1,520 kB/s)                              
  Reading package lists... Done
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  Calculating upgrade... Done
  The following packages were automatically installed and are no longer 
required:
    libzstd0 linux-headers-4.4.0-109 linux-headers-4.4.0-109-generic 
linux-image-4.4.0-109-generic
    linux-image-extra-4.4.0-109-generic linux-signed-image-4.4.0-109-generic 
linux-tools-4.4.0-109
    linux-tools-4.4.0-109-generic
  Use 'sudo apt autoremove' to remove them.
  The following packages will be upgraded:
    apt apt-transport-https apt-utils initramfs-tools initramfs-tools-bin 
initramfs-tools-core libapt-inst2.0
    libapt-pkg5.0 libpam-systemd libpci-dev libpci3 libsystemd0 libudev-dev 
libudev1 lshw makedumpfile pciutils
    python-crypto systemd systemd-sysv udev
  21 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
  Need to get 246 kB/8,157 kB of archives.
  After this operation, 16.4 kB of additional disk space will be used.
  Do you want to continue? [Y/n] 
  Get:1 file:/srv/mirror/ubuntu xenial-updates/main amd64 libapt-pkg5.0 amd64 
1.2.26 [706 kB]
  Get:2 file:/srv/mirror/ubuntu xenial-updates/main amd64 libapt-inst2.0 amd64 
1.2.26 [55.4 kB]
  Get:3 file:/srv/mirror/ubuntu xenial-updates/main amd64 apt amd64 1.2.26 
[1,043 kB]
  Get:4 file:/srv/mirror/ubuntu xenial-updates/main amd64 apt-utils amd64 
1.2.26 [197 kB]
  Get:5 file:/srv/mirror/ubuntu xenial-updates/main amd64 libudev-dev amd64 
229-4ubuntu21.2 [150 kB]
  Get:6 file:/srv/mirror/ubuntu xenial-updates/main amd64 libsystemd0 amd64 
229-4ubuntu21.2 [205 kB]
  Get:7 file:/srv/mirror/ubuntu xenial-updates/main amd64 libpam-systemd amd64 
229-4ubuntu21.2 [115 kB]
  Get:8 http://security.ubuntu.com/ubuntu xenial-security/main amd64 
python-crypto amd64 2.6.1-6ubuntu0.16.04.3 [246 kB]
  Get:9 file:/srv/mirror/ubuntu xenial-updates/main amd64 systemd amd64 
229-4ubuntu21.2 [3,634 kB]
  Get:10 file:/srv/mirror/ubuntu xenial-updates/main amd64 udev amd64 
229-4ubuntu21.2 [993 kB]
  Get:11 file:/srv/mirror/ubuntu xenial-updates/main amd64 libudev1 amd64 
229-4ubuntu21.2 [54.4 kB]
  Get:12 file:/srv/mirror/ubuntu xenial-updates/main amd64 initramfs-tools all 
0.122ubuntu8.11 [8,590 B]
  Get:13 file:/srv/mirror/ubuntu xenial-updates/main amd64 initramfs-tools-core 
all 0.122ubuntu8.11 [42.9 kB]
  Get:14 file:/srv/mirror/ubuntu xenial-updates/main amd64 initramfs-tools-bin 
amd64 0.122ubuntu8.11 [9,592 B]
  Get:15 file:/srv/mirror/ubuntu xenial-updates/main amd64 systemd-sysv amd64 
229-4ubuntu21.2 [11.9 kB]
  Get:16 file:/srv/mirror/ubuntu xenial-updates/main amd64 apt-transport-https 
amd64 1.2.26 [26.1 kB]
  Get:17 file:/srv/mirror/ubuntu xenial-updates/main amd64 pciutils amd64 
1:3.3.1-1.1ubuntu1.2 [234 kB]
  Get:18 file:/srv/mirror/ubuntu xenial-updates/main amd64 libpci-dev amd64 
1:3.3.1-1.1ubuntu1.2 [42.7 kB]
  Get:19 file:/srv/mirror/ubuntu xenial-updates/main amd64 libpci3 amd64 
1:3.3.1-1.1ubuntu1.2 [24.5 kB]
  Get:20 file:/srv/mirror/ubuntu xenial-updates/main amd64 lshw amd64 
02.17-1.1ubuntu3.5 [215 kB]
  Get:21 file:/srv/mirror/ubuntu xenial-updates/main amd64 makedumpfile amd64 
1:1.5.9-5ubuntu0.6 [143 kB]
  Fetched 246 kB in 0s (491 kB/s)         
  (Reading database ... 186732 files and directories currently installed.)
  Preparing to unpack .../libapt-pkg5.0_1.2.26_amd64.deb ...
  Unpacking libapt-pkg5.0:amd64 (1.2.26) over (1.2.25) ...
  Processing triggers for libc-bin (2.23-0ubuntu10) ...
  Setting up libapt-pkg5.0:amd64 (1.2.26) ...
  Processing triggers for libc-bin (2.23-0ubuntu10) ...
  (Reading database ... 186732 files and directories currently installed.)
  Preparing to unpack .../libapt-inst2.0_1.2.26_amd64.deb ...
  Unpacking libapt-inst2.0:amd64 (1.2.26) over (1.2.25) ...
  Preparing to unpack .../a/apt/apt_1.2.26_amd64.deb ...
  Unpacking apt (1.2.26) over (1.2.25) ...
  Processing triggers for libc-bin (2.23-0ubuntu10) ...
  Processing triggers for man-db (2.7.5-1) ...
  Setting up apt (1.2.26) ...
  Processing triggers for libc-bin (2.23-0ubuntu10) ...
  dpkg: error: dpkg status database is locked by another process
  E: Sub-process /usr/bin/dpkg returned an error code (2)
  root@wopr:~# apt-get update && apt-get -u dist-upgrade
  Get:1 file:/srv/mirror/ubuntu xenial InRelease [247 kB]
  Get:1 file:/srv/mirror/ubuntu xenial InRelease [247 kB]
  Get:2 file:/srv/mirror/ubuntu xenial-updates InRelease [102 kB]               
    
  Get:2 file:/srv/mirror/ubuntu xenial-updates InRelease [102 kB]               
         
  Hit:3 http://security.ubuntu.com/ubuntu xenial-security InRelease             
                                   
  Reading package lists... Done
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  You might want to run 'apt-get -f install' to correct these.
  The following packages have unmet dependencies:
   apt-utils : Depends: apt (= 1.2.25) but 1.2.26 is installed
  E: Unmet dependencies. Try using -f.
  root@wopr:~# ubuntu-bug apt

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: apt 1.2.26
  ProcVersionSignature: Ubuntu 4.4.0-108.131-generic 4.4.98
  Uname: Linux 4.4.0-108-generic x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
  ApportVersion: 2.20.1-0ubuntu2.15
  Architecture: amd64
  Date: Tue Apr  3 12:57:30 2018
  InstallationDate: Installed on 2016-04-04 (729 days ago)
  InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Beta amd64 
(20160325)
  ProcEnviron:
   TERM=rxvt-unicode
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: apt
  UpgradeStatus: No upgrade log present (probably fresh install)

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