[Bug 1175895] [NEW] do-release-upgrade fails: TypeError: decode() argument 1 must be string, not None

[Christian Weiske]

Public bug reported:

Trying to upgrade from 12.04 to the next version, I get the following
error:

$ LC_ALL=C do-release-upgrade
....
WARNING: Failed to read mirror file

Third party sources disabled

Some third party entries in your sources.list were disabled. You can 
re-enable them after the upgrade with the 'software-properties' tool 
or your package manager. 

To continue please press [ENTER]


A fatal error occurred

Please report this as a bug and include the files 
/var/log/dist-upgrade/main.log and /var/log/dist-upgrade/apt.log in 
your report. The upgrade has aborted. 
Your original sources.list was saved in 
/etc/apt/sources.list.distUpgrade. 

Traceback (most recent call last):

File "/tmp/update-manager-ewoDWd/quantal", line 10, in <module> 
sys.exit(main()) 

File "/tmp/update-manager-ewoDWd/DistUpgrade/DistUpgradeMain.py", 
line 240, in main 
if app.run(): 

File 
"/tmp/update-manager-ewoDWd/DistUpgrade/DistUpgradeController.py", 
line 1764, in run 
return self.fullUpgrade() 

File 
"/tmp/update-manager-ewoDWd/DistUpgrade/DistUpgradeController.py", 
line 1663, in fullUpgrade 
if not self.updateSourcesList(): 

File 
"/tmp/update-manager-ewoDWd/DistUpgrade/DistUpgradeController.py", 
line 803, in updateSourcesList 
_("Some third party entries in your sources.list " 

File "/tmp/update-manager-ewoDWd/DistUpgrade/DistUpgradeViewText.py", 
line 138, in information 
sys.stdin.readline().decode(ENCODING, "backslashreplace") 

TypeError: decode() argument 1 must be string, not None

** Affects: apt (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "main.log"
   https://bugs.launchpad.net/bugs/1175895/+attachment/3663366/+files/main.log

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https://bugs.launchpad.net/bugs/1175895

Title:
  do-release-upgrade fails: TypeError: decode() argument 1 must be
  string, not None

Status in “apt” package in Ubuntu:
  New

Bug description:
  Trying to upgrade from 12.04 to the next version, I get the following
  error:

  $ LC_ALL=C do-release-upgrade
  ....
  WARNING: Failed to read mirror file

  Third party sources disabled

  Some third party entries in your sources.list were disabled. You can 
  re-enable them after the upgrade with the 'software-properties' tool 
  or your package manager. 

  To continue please press [ENTER]


  A fatal error occurred

  Please report this as a bug and include the files 
  /var/log/dist-upgrade/main.log and /var/log/dist-upgrade/apt.log in 
  your report. The upgrade has aborted. 
  Your original sources.list was saved in 
  /etc/apt/sources.list.distUpgrade. 

  Traceback (most recent call last):

  File "/tmp/update-manager-ewoDWd/quantal", line 10, in <module> 
  sys.exit(main()) 

  File "/tmp/update-manager-ewoDWd/DistUpgrade/DistUpgradeMain.py", 
  line 240, in main 
  if app.run(): 

  File 
  "/tmp/update-manager-ewoDWd/DistUpgrade/DistUpgradeController.py", 
  line 1764, in run 
  return self.fullUpgrade() 

  File 
  "/tmp/update-manager-ewoDWd/DistUpgrade/DistUpgradeController.py", 
  line 1663, in fullUpgrade 
  if not self.updateSourcesList(): 

  File 
  "/tmp/update-manager-ewoDWd/DistUpgrade/DistUpgradeController.py", 
  line 803, in updateSourcesList 
  _("Some third party entries in your sources.list " 

  File "/tmp/update-manager-ewoDWd/DistUpgrade/DistUpgradeViewText.py", 
  line 138, in information 
  sys.stdin.readline().decode(ENCODING, "backslashreplace") 

  TypeError: decode() argument 1 must be string, not None

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