Public bug reported:

After installing apparmor, apparmor-utils, and libapache2-mod-apparmor
and enabling a virtual host that uses the changehat feature, it is
impossible to "(A)dd Requested Hat" or "(U)se Default Hat" because there
isinconsistent use of q.promptUser() call in the " elif type ==
'unknown_hat' block on line 1097 in aa.py

Changing
  ans = q.promptUser()
to
  ans = q.promptUser()[0].strip()
OR
  ans, selected = q.promptUser()
OR
  ans, arg = q.promptUser()
resolves this problem because ans is no longer assigned a tuple data type and 
can be evaluated against CMD_* variables

Further execution of code inside the 'unknown_hat' elif block is buggy
but not within the scope of this bug report.

---

Debugging info:

uname -a:
Linux hostname 4.4.0-112-generic #135-Ubuntu SMP Fri Jan 19 11:48:36 UTC 2018 
x86_64 x86_64 x86_64 GNU/Linux

cat /etc/issue
Ubuntu 16.04.3 LTS \n \l

apt-cache policy apparmor-utils
apparmor-utils:
  Installed: 2.10.95-0ubuntu2.8
  Candidate: 2.10.95-0ubuntu2.8
 *** 2.10.95-0ubuntu2.8 500
        500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 
Packages
        100 /var/lib/dpkg/status

apt-cache policy apparmor
apparmor:
  Installed: 2.10.95-0ubuntu2.6
  Candidate: 2.10.95-0ubuntu2.8
  Version table:
     2.10.95-0ubuntu2.8 500
        500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 
Packages

apt-cache policy libapache2-mod-apparmor
libapache2-mod-apparmor:
  Installed: 2.10.95-0ubuntu2.8
  Candidate: 2.10.95-0ubuntu2.8
  Version table:
 *** 2.10.95-0ubuntu2.8 500
        500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 
Packages
        100 /var/lib/dpkg/status

** Affects: apparmor (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  After installing apparmor, apparmor-utils, and libapache2-mod-apparmor
  and enabling a virtual host that uses the changehat feature, it is
  impossible to "(A)dd Requested Hat" or "(U)se Default Hat" because there
  isinconsistent use of q.promptUser() call in the " elif type ==
  'unknown_hat' block on line 1097 in aa.py
  
- Changing 
-   ans = q.promptUser() 
+ Changing
+   ans = q.promptUser()
  to
-   ans = q.promptUser()[0].strip()
+   ans = q.promptUser()[0].strip()
  OR
-   ans, selected = q.promptUser()
+   ans, selected = q.promptUser()
  OR
-   ans, arg = q.promptUser()
+   ans, arg = q.promptUser()
  resolves this problem because ans is no longer assigned a tuple data type and 
can be evaluated against CMD_* variables
  
  Further execution of code inside the 'unknown_hat' elif block is buggy
  but not within the scope of this bug report.
  
  ---
  
  Debugging info:
  
  uname -a:
  Linux hostname 4.4.0-112-generic #135-Ubuntu SMP Fri Jan 19 11:48:36 UTC 2018 
x86_64 x86_64 x86_64 GNU/Linux
  
  cat /etc/issue
  Ubuntu 16.04.3 LTS \n \l
  
  apt-cache policy apparmor-utils
  apparmor-utils:
-   Installed: 2.10.95-0ubuntu2.8
-   Candidate: 2.10.95-0ubuntu2.8
-  *** 2.10.95-0ubuntu2.8 500
-         500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 
Packages
-         100 /var/lib/dpkg/status
+   Installed: 2.10.95-0ubuntu2.8
+   Candidate: 2.10.95-0ubuntu2.8
+  *** 2.10.95-0ubuntu2.8 500
+         500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 
Packages
+         100 /var/lib/dpkg/status
+ 
  apt-cache policy apparmor
  apparmor:
-   Installed: 2.10.95-0ubuntu2.6
-   Candidate: 2.10.95-0ubuntu2.8
-   Version table:
-      2.10.95-0ubuntu2.8 500
-         500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 
Packages
- apt-cache policy libapache2-mod-apparmor 
+   Installed: 2.10.95-0ubuntu2.6
+   Candidate: 2.10.95-0ubuntu2.8
+   Version table:
+      2.10.95-0ubuntu2.8 500
+         500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 
Packages
+ 
+ apt-cache policy libapache2-mod-apparmor
  libapache2-mod-apparmor:
-   Installed: 2.10.95-0ubuntu2.8
-   Candidate: 2.10.95-0ubuntu2.8
-   Version table:
-  *** 2.10.95-0ubuntu2.8 500
-         500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 
Packages
-         100 /var/lib/dpkg/status
+   Installed: 2.10.95-0ubuntu2.8
+   Candidate: 2.10.95-0ubuntu2.8
+   Version table:
+  *** 2.10.95-0ubuntu2.8 500
+         500 http://us.archive.ubuntu.com/ubuntu xenial-updates/main amd64 
Packages
+         100 /var/lib/dpkg/status

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https://bugs.launchpad.net/bugs/1752365

Title:
  Cannot Add Request Hat or Use Default Hat in aa-logprof and
  mod_apparmor

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