[Bug 1818133] Re: do-release-upgrade error: SystemError: E:Unable to correct problems, you have held broken packages

[Juan Villa]

I had the same problem.
After the 
 SystemError: E:Unable to correct problems, you have held broken packages.
line
the next one was a prompt about retrying. I did retry and everything worked

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https://bugs.launchpad.net/bugs/1818133

Title:
  do-release-upgrade error: SystemError: E:Unable to correct problems,
  you have held broken packages

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

Bug description:
  Today i tried to upgrade my ubuntu server:
  Distributor ID: Ubuntu
  Description:    Ubuntu 16.04.6 LTS
  Release:        16.04
  Codename:       xenial

  But i got a nasty error:

  ---------------------------------------------------------------------------------------------------
  Investigating (4) python3-twisted [ amd64 ] < none -> 17.9.0-2 > ( python )
  Broken python3-twisted:amd64 Depends on python3-zope.interface [ amd64 ] < 4.3.2-1+ubuntu16.04.1+certbot+1 > ( zope ) (>= 4.0.2)
    Considering python3-zope.interface:amd64 10000 as a solution to python3-twisted:amd64 10000
    Considering python3-zope.interface:amd64 10000 as a solution to python3-twisted:amd64 10000
  Done

  Traceback (most recent call last):
    File "/tmp/ubuntu-release-upgrader-td6fitjd/bionic", line 8, in <module>
      sys.exit(main())
    File "/tmp/ubuntu-release-upgrader-td6fitjd/DistUpgrade/DistUpgradeMain.py", line 238, in main
      if app.run():
    File "/tmp/ubuntu-release-upgrader-td6fitjd/DistUpgrade/DistUpgradeController.py", line 2053, in run
      return self.fullUpgrade()
    File "/tmp/ubuntu-release-upgrader-td6fitjd/DistUpgrade/DistUpgradeController.py", line 1962, in fullUpgrade
      if not self.askDistUpgrade():
    File "/tmp/ubuntu-release-upgrader-td6fitjd/DistUpgrade/DistUpgradeController.py", line 1142, in askDistUpgrade
      changes = self.calcDistUpgrade()
    File "/tmp/ubuntu-release-upgrader-td6fitjd/DistUpgrade/DistUpgradeController.py", line 1109, in calcDistUpgrade
      if not self.cache.installTasks(self.tasks):
    File "/tmp/ubuntu-release-upgrader-td6fitjd/DistUpgrade/DistUpgradeCache.py", line 856, in installTasks
      pkg.mark_install()
    File "/usr/lib/python3/dist-packages/apt/package.py", line 1304, in mark_install
      fixer.resolve(True)
  SystemError: E:Unable to correct problems, you have held broken packages.
  Error in sys.excepthook:
  Traceback (most recent call last):
    File "/usr/lib/python3/dist-packages/problem_report.py", line 497, in add_to_existing
      self.write(f)
    File "/usr/lib/python3/dist-packages/problem_report.py", line 450, in write
      block = f.read(1048576)
    File "/usr/lib/python3.5/codecs.py", line 321, in decode
      (result, consumed) = self._buffer_decode(data, self.errors, final)
  UnicodeDecodeError: 'utf-8' codec can't decode byte 0x8b in position 1: invalid start byte

  Original exception was:
  Traceback (most recent call last):
    File "/tmp/ubuntu-release-upgrader-td6fitjd/bionic", line 8, in <module>
      sys.exit(main())
    File "/tmp/ubuntu-release-upgrader-td6fitjd/DistUpgrade/DistUpgradeMain.py", line 238, in main
      if app.run():
    File "/tmp/ubuntu-release-upgrader-td6fitjd/DistUpgrade/DistUpgradeController.py", line 2053, in run
      return self.fullUpgrade()
    File "/tmp/ubuntu-release-upgrader-td6fitjd/DistUpgrade/DistUpgradeController.py", line 1962, in fullUpgrade
      if not self.askDistUpgrade():
    File "/tmp/ubuntu-release-upgrader-td6fitjd/DistUpgrade/DistUpgradeController.py", line 1142, in askDistUpgrade
      changes = self.calcDistUpgrade()
    File "/tmp/ubuntu-release-upgrader-td6fitjd/DistUpgrade/DistUpgradeController.py", line 1109, in calcDistUpgrade
      if not self.cache.installTasks(self.tasks):
    File "/tmp/ubuntu-release-upgrader-td6fitjd/DistUpgrade/DistUpgradeCache.py", line 856, in installTasks
      pkg.mark_install()
    File "/usr/lib/python3/dist-packages/apt/package.py", line 1304, in mark_install
      fixer.resolve(True)
  SystemError: E:Unable to correct problems, you have held broken packages.
  ---------------------------------------------------------------------------------------------------

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