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
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