** Description changed:

  [Impact]
- unattended-upgrades does not work (reliably) in (bionic and) cosmic with the 
mirror:// method, as it tries to open the mirror file - which recent apt 
versions store in auxfiles - as a .deb:
  
+ unattended-upgrades does not work (reliably) in (bionic and) cosmic with
+ the mirror:// method, as it tries to open the mirror file - which recent
+ apt versions store in auxfiles - as a .deb:
  
  2018-10-04 08:58:46,801 ERROR failed to read deb file 
/var/lib/apt/lists/auxfiles/_etc_apt_mirrors.list (E:Invalid archive signature)
  2018-10-04 08:58:46,801 ERROR failed to read deb file 
/var/lib/apt/lists/auxfiles/_etc_apt_mirrors.list (E:Invalid archive signature)
  2018-10-04 08:58:46,807 ERROR Apt returned an error, exiting
  2018-10-04 08:58:46,807 ERROR error message: E:Invalid archive signature
  2018-10-04 08:58:46,808 ERROR An error occurred: E:Invalid archive signature
  Traceback (most recent call last):
+   File "/usr/bin/unattended-upgrade", line 1595, in main
+     install_start_time)
+   File "/usr/bin/unattended-upgrade", line 1800, in run
+     if conffile_prompt(item.destfile):
+   File "/usr/bin/unattended-upgrade", line 860, in conffile_prompt
+     deb = apt_inst.DebFile(destFile)
+ apt_pkg.Error: E:Invalid archive signature
+ 
+ [Test case]
+ 
+ 1. Start with a not fully upgrades system, then configure it to use
+ mirror:// :
+ 
+ root@cc-apt:~# echo 'deb mirror+file:/etc/apt/mirrors.list cosmic main
+ restricted' > /etc/apt/sources.list.d/mirrors-cosmic.list
+ 
+ root@cc-apt:~# echo 'http://ftp.kfki.hu/linux/ubuntu/' > /etc/apt/mirrors.list
+ root@cc-apt:~# echo 'Unattended-Upgrade::DevRelease "true";' > 
/etc/apt/apt.conf.d/51unattended-upgrades-on-deb
+ root@cc-apt:~# apt update
+ Get:1 file:/etc/apt/mirrors.list Mirrorlist [33 B]
+ Get:2 http://ftp.kfki.hu/linux/ubuntu cosmic InRelease [242 kB]
+ ...
+ Translation-en [73.7 kB]                          
+ Fetched 27.1 MB in 10s (2812 kB/s)                                            
                                     
+ Reading package lists... Done
+ Building dependency tree       
+ Reading state information... Done
+ 280 packages can be upgraded. Run 'apt list --upgradable' to see them.
+ 
+ 2. Clean downloaded files to make u-u redownload them:
+ root@cc-apt:~# apt-get clean 
+ root@cc-apt:~# rm -f /var/lib/apt/lists/auxfiles/*
+ 
+ 3. Run u-u and observe it crashing with the not fixed version and
+ proceeding properly after the fix is applied.
+ 
+ root@cc-apt:~# unattended-upgrade --dry-run
+ Apt returned an error, exiting
+ error message: E:Invalid archive signature
+ Traceback (most recent call last):
+   File "/usr/bin/unattended-upgrade", line 2064, in <module>
+     sys.exit(main(options))
    File "/usr/bin/unattended-upgrade", line 1595, in main
      install_start_time)
    File "/usr/bin/unattended-upgrade", line 1800, in run
      if conffile_prompt(item.destfile):
    File "/usr/bin/unattended-upgrade", line 860, in conffile_prompt
      deb = apt_inst.DebFile(destFile)
  apt_pkg.Error: E:Invalid archive signature
  
- [Test case]
- To figure out. It did work for me sometimes, so...
  
  [Regression potential]
- To figure out.
+ 
+ The fix makes u-u check only files with .deb extension if they may raise
+ configuration prompt. For supporting other file extensions the file name
+ pattern will need to be updated.

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https://bugs.launchpad.net/bugs/1796100

Title:
  crashes while trying to open auxfiles as .deb

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