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[Balint Reczey <balint.reczey@xxxxxxxxxxxxx>]

U-u is fixed in version 1.2.

** Also affects: python-apt (Ubuntu)
   Importance: Undecided
       Status: New

** Description changed:

  [Impact]
  
-  * Unattended-upgrades fails to autoremove packages after installing
+  * Unattended-upgrades fails to autoremove packages after installing
  updates or fails to install updates due to a parallel process acquiring
  apt or dpkg lock while u-u is running.
  
  [Test Case]
  
-  * Set up a system with packages (> 30) to be upgraded. In case of
+  * Set up a system with packages (> 30) to be upgraded. In case of
  Bionic -security has a low number of updates, thus set up the system to
  install -updates to have more packages for u-u to upgrade:
  
-  echo 'Unattended-Upgrade::Allowed-Origins::
+  echo 'Unattended-Upgrade::Allowed-Origins::
  "${distro_id}:${distro_codename}-updates";' >
  /etc/apt/apt.conf.d/51-updates
  
-  * Set up two shells to run commands in parallel
-  * In shell "A" run sudo apt update && sudo unattended-upgrade --dry-run --verbose --debug
-  * After u-u started run the following command in shell "B":
-  while sleep 1; do python3 -c 'import apt; import apt_pkg; print(apt_pkg.pkgsystem_lock())' ; done
-  * Observe the following exception repeated while running u-u and True being printed after u-u is finished:
+  * Set up two shells to run commands in parallel
+  * In shell "A" run sudo apt update && sudo unattended-upgrade --dry-run --verbose --debug
+  * After u-u started run the following command in shell "B":
+  while sleep 1; do python3 -c 'import apt; import apt_pkg; print(apt_pkg.pkgsystem_lock())' ; done
+  * Observe the following exception repeated while running u-u and True being printed after u-u is finished:
  ...
  Traceback (most recent call last):
-   File "<string>", line 1, in <module>
+   File "<string>", line 1, in <module>
  apt_pkg.Error: E:Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable), E:Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?
  Traceback (most recent call last):
-   File "<string>", line 1, in <module>
+   File "<string>", line 1, in <module>
  apt_pkg.Error: E:Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable), E:Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?
  True
  Traceback (most recent call last):
-   File "<string>", line 1, in <module>
+   File "<string>", line 1, in <module>
  apt_pkg.Error: E:Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable), E:Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?
  True
  True
  True
  True
  ...
  
  [Regression Potential WIP]
  
-  * Unattended-upgrade may crash
+  * Unattended-upgrade may crash
+ 
+ [Other Info]
+ 
+ It looks like python-apt also releases the lock sometimes unexpectedly
+ thus the both packages need to be fixed to avoid loosing the lock.
  
  [Original Bug Text]
  
  The Ubuntu Error Tracker has been receiving reports about a problem
  regarding unattended-upgrades.  This problem was most recently seen with
  version 0.90, the problem page at
  https://errors.ubuntu.com/problem/19f99745d7dce5aea118eb31bfffcbdcdf238c4f
  contains more details.

** Also affects: python-apt (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Also affects: unattended-upgrades (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: unattended-upgrades (Ubuntu)
       Status: Confirmed => Fix Released

** Also affects: python-apt (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Also affects: unattended-upgrades (Ubuntu Bionic)
   Importance: Undecided
       Status: New

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Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1602536

Title:
  /usr/bin/unattended-upgrade:apt.cache.LockFailedException:/usr/bin
  /unattended-
  upgrade@1468:main:do_auto_remove:cache_commit:commit:_fetch_archives

Status in python-apt package in Ubuntu:
  New
Status in unattended-upgrades package in Ubuntu:
  Fix Released
Status in python-apt source package in Xenial:
  New
Status in unattended-upgrades source package in Xenial:
  New
Status in python-apt source package in Bionic:
  New
Status in unattended-upgrades source package in Bionic:
  New

Bug description:
  [Impact]

   * Unattended-upgrades fails to autoremove packages after installing
  updates or fails to install updates due to a parallel process
  acquiring apt or dpkg lock while u-u is running.

  [Test Case]

   * Set up a system with packages (> 30) to be upgraded. In case of
  Bionic -security has a low number of updates, thus set up the system
  to install -updates to have more packages for u-u to upgrade:

   echo 'Unattended-Upgrade::Allowed-Origins::
  "${distro_id}:${distro_codename}-updates";' >
  /etc/apt/apt.conf.d/51-updates

   * Set up two shells to run commands in parallel
   * In shell "A" run sudo apt update && sudo unattended-upgrade --dry-run --verbose --debug
   * After u-u started run the following command in shell "B":
   while sleep 1; do python3 -c 'import apt; import apt_pkg; print(apt_pkg.pkgsystem_lock())' ; done
   * Observe the following exception repeated while running u-u and True being printed after u-u is finished:
  ...
  Traceback (most recent call last):
    File "<string>", line 1, in <module>
  apt_pkg.Error: E:Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable), E:Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?
  Traceback (most recent call last):
    File "<string>", line 1, in <module>
  apt_pkg.Error: E:Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable), E:Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?
  True
  Traceback (most recent call last):
    File "<string>", line 1, in <module>
  apt_pkg.Error: E:Could not get lock /var/lib/dpkg/lock - open (11: Resource temporarily unavailable), E:Unable to lock the administration directory (/var/lib/dpkg/), is another process using it?
  True
  True
  True
  True
  ...

  [Regression Potential WIP]

   * Unattended-upgrade may crash

  [Other Info]

  It looks like python-apt also releases the lock sometimes unexpectedly
  thus the both packages need to be fixed to avoid loosing the lock.

  [Original Bug Text]

  The Ubuntu Error Tracker has been receiving reports about a problem
  regarding unattended-upgrades.  This problem was most recently seen
  with version 0.90, the problem page at
  https://errors.ubuntu.com/problem/19f99745d7dce5aea118eb31bfffcbdcdf238c4f
  contains more details.

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