[Bug 1781412] Re: do-release-upgrade crashed with UnboundLocalError in _replaceDebsWithSnaps(): local variable 'proc' referenced before assignment

[Brian Murray]

Here's the Traceback:

Traceback (most recent call last):
  File "./bionic", line 8, in <module>
    sys.exit(main())
  File "/tmp/u-r-u/DistUpgrade/DistUpgradeMain.py", line 238, in main
    if app.run():
  File "/tmp/u-r-u/DistUpgrade/DistUpgradeController.py", line 1949, in run
    return self.fullUpgrade()
  File "/tmp/u-r-u/DistUpgrade/DistUpgradeController.py", line 1926, in fullUpgrade
    self.doPostUpgrade()
  File "/tmp/u-r-u/DistUpgrade/DistUpgradeController.py", line 1336, in doPostUpgrade
    self.quirks.run("PostUpgrade")
  File "/tmp/u-r-u/DistUpgrade/DistUpgradeQuirks.py", line 113, in run
    func()
  File "/tmp/u-r-u/DistUpgrade/DistUpgradeQuirks.py", line 138, in bionicPostUpgrade
    self._replaceDebsWithSnaps()
  File "/tmp/u-r-u/DistUpgrade/DistUpgradeQuirks.py", line 543, in _replaceDebsWithSnaps
    if proc.returncode == 0:
UnboundLocalError: local variable 'proc' referenced before assignment

** Information type changed from Private to Public

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => In Progress

** Changed in: ubuntu-release-upgrader (Ubuntu)
   Importance: Undecided => High

** Changed in: ubuntu-release-upgrader (Ubuntu)
     Assignee: (unassigned) => Brian Murray (brian-murray)

** Also affects: ubuntu-release-upgrader (Ubuntu Bionic)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1781412

Title:
  do-release-upgrade crashed with UnboundLocalError in
  _replaceDebsWithSnaps(): local variable 'proc' referenced before
  assignment

Status in ubuntu-release-upgrader package in Ubuntu:
  In Progress
Status in ubuntu-release-upgrader source package in Bionic:
  New

Bug description:
  I was testing a release upgrade from Ubuntu 16.04 to Ubuntu 18.04
  where I had no connectivity to the snap store and encountered this
  crash.

  ProblemType: Crash
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.20
  ProcVersionSignature: Ubuntu 4.4.0-121.145-generic 4.4.117
  Uname: Linux 4.4.0-121-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7.2
  Architecture: amd64
  CrashDB: ubuntu
  Date: Wed Jul 11 20:03:49 2018
  ExecutablePath: /usr/bin/do-release-upgrade
  ExecutableTimestamp: 1531169948
  InstallationDate: Installed on 2016-10-04 (645 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  InterpreterPath: /usr/bin/python3.5
  PackageArchitecture: all
  ProcCmdline: /usr/bin/python3 ./bionic --frontend DistUpgradeViewText
  ProcCwd: /tmp/u-r-u
  ProcEnviron:
   TERM=screen
   SHELL=/bin/bash
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   LC_CTYPE=en_US.UTF-8
  Python3Details: /usr/bin/python3.6, Python 3.6.5, python3-minimal, 3.6.5-3ubuntu1
  PythonArgs: ['/usr/bin/do-release-upgrade', '--frontend', 'DistUpgradeViewText']
  PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
  SourcePackage: ubuntu-release-upgrader
  Title: do-release-upgrade crashed with UnboundLocalError in _replaceDebsWithSnaps(): local variable 'proc' referenced before assignment
  UpgradeStatus: Upgraded to bionic on 2018-07-12 (0 days ago)
  UserGroups:
   
  modified.conffile..etc.update-manager.release-upgrades: [modified]
  mtime.conffile..etc.update-manager.release-upgrades: 2016-10-04T13:43:38.934395

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