[Bug 1810565] Re: Ubuntu 16.04 to Ubuntu18.04 upgrade fails on snap debug connectivity without logging any useful logs

[sergiiF]

All logs from there:
2019-01-03 21:02:19,137 INFO Using config files '['./DistUpgrade.cfg.xenial']'
2019-01-03 21:02:19,137 INFO uname information: 'Linux skashaba-laptop 4.4.0-83-gene
ric #106-Ubuntu SMP Mon Jun 26 17:54:43 UTC 2017 x86_64'
2019-01-03 21:02:19,410 INFO apt version: '1.2.20'
2019-01-03 21:02:19,411 INFO python version: '3.5.2 (default, Nov 17 2016, 17:05:23)
 
[GCC 5.4.0 20160609]'
2019-01-03 21:02:19,413 INFO release-upgrader version '18.04.29' started
2019-01-03 21:02:19,417 INFO locale: 'en_US' 'UTF-8'
2019-01-03 21:02:19,460 INFO screen could not be run
2019-01-03 21:02:19,520 DEBUG Using 'DistUpgradeViewText' view
2019-01-03 21:02:19,563 DEBUG enable dpkg --force-overwrite
2019-01-03 21:02:19,583 DEBUG creating statefile: '/var/log/dist-upgrade/apt-clone_s
ystem_state.tar.gz'
2019-01-03 21:02:21,398 DEBUG lsb-release: 'xenial'
2019-01-03 21:02:21,399 DEBUG _pythonSymlinkCheck run
2019-01-03 21:02:21,400 DEBUG openCache()
2019-01-03 21:02:21,400 DEBUG No such plugin directory: ./plugins
2019-01-03 21:02:21,400 DEBUG plugins for condition 'PreCacheOpen' are '[]'
2019-01-03 21:02:21,400 DEBUG plugins for condition 'bionicPreCacheOpen' are '[]'
2019-01-03 21:02:21,400 DEBUG plugins for condition 'from_xenialPreCacheOpen' are '[]'
2019-01-03 21:02:21,400 DEBUG quirks: running PreCacheOpen
2019-01-03 21:02:21,400 DEBUG running Quirks.PreCacheOpen
2019-01-03 21:02:21,851 DEBUG /openCache(), new cache size 81917
2019-01-03 21:02:21,852 DEBUG need_server_mode(): run in 'desktop' mode, (because of pkg 'ubuntu-desktop')
2019-01-03 21:02:21,852 DEBUG checkViewDepends()
2019-01-03 21:02:21,852 DEBUG running doUpdate() (showErrors=False)
2019-01-03 21:02:22,509 DEBUG openCache()
2019-01-03 21:02:23,003 DEBUG /openCache(), new cache size 81917
2019-01-03 21:02:23,004 DEBUG doPostInitialUpdate
2019-01-03 21:02:23,004 DEBUG plugins for condition 'PostInitialUpdate' are '[]'
2019-01-03 21:02:23,004 DEBUG plugins for condition 'bionicPostInitialUpdate' are '[]'
2019-01-03 21:02:23,004 DEBUG plugins for condition 'from_xenialPostInitialUpdate' are '[]'
2019-01-03 21:02:23,004 DEBUG quirks: running bionicPostInitialUpdate
2019-01-03 21:02:23,004 DEBUG running Quirks.bionicPostInitialUpdate
2019-01-03 21:02:23,016 DEBUG abort called
2019-01-03 21:16:41,405 DEBUG openCache()
2019-01-03 21:16:41,405 DEBUG failed to SystemUnLock() (E:Not locked) 
2019-01-03 21:16:41,904 DEBUG /openCache(), new cache size 81917

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https://bugs.launchpad.net/bugs/1810565

Title:
  Ubuntu 16.04 to Ubuntu18.04 upgrade fails on snap debug connectivity
  without  logging any useful logs

Status in ubuntu-release-upgrader package in Ubuntu:
  Incomplete

Bug description:
  While running the do-release-upgrade I faced the issue. The output from log is like:
  DEBUG quirks: running bionicPostInitialUpdate
  DEBUG running Quirks.bionicPostInitialUpdate
  DEBUG abort called

  After some troubleshooting I found that it was failing on calling 'snap debug connectivity'.
  Snap version I had was a bit old, which caused it to fail with panic on slice out of range.

  The issue is insufficient logging. Because of the actual error was not
  logged, It was impossible to find the issue without code debugging.

  It would be awesome if you can put more logs into
  _checkStoreConnectivity function and log stderr and stdout output from
  popen.communicate before calling self.controller.abort()

  Also it would be extremely useful to log traceback from abort. Can
  simplify the troubleshooting dramatically.

  Thanks.

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