Public bug reported:
When trying to upgrade Ubuntu either through the terminal (sudo do-
release-upgrade) or through the software updater, it will fail just
after starting saying that "An unresolvable error occurred while
calculating the upgrade" and it can't continue.
The error I got is this:
An unresolvable problem occurred while calculating the upgrade.
This can be caused by:
* Upgrading to a pre-release version of Ubuntu
* Running the current pre-release version of Ubuntu
* Unofficial software packages not provided by Ubuntu
If none of this applies, then please report this bug using the
command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.
I've looked around for a solution, but I couldn't find any so I'm
reporting it. I don't know if duelbooting Windows 10 on the same drive
could potentially do something, but that's why I'm reporting this bug.
Looking at the upgrade log files (/var/log/dist-upgrade/main.log), I
noticed that close to the end it errors on trying to run SystemUnLock()
and fails as it is already unlocked (I'm just typing what it said).
1) Release version: 14.04.3 LTS Trusty Tahr
2) Version of package: 1.0.220.8
3) What I expected to happen: The upgrade process to continue normally.
4) What happened instead: The upgrade failed and notified without much
information.
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.8
ProcVersionSignature: Ubuntu 3.13.0-76.120-generic 3.13.11-ckt30
Uname: Linux 3.13.0-76-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Fri Jan 22 07:42:06 2016
InstallationDate: Installed on 2015-01-20 (366 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to trusty on 2016-01-22 (0 days ago)
mtime.conffile..etc.update.manager.release.upgrades: 2016-01-21T21:18:22.748253
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug dist-upgrade trusty
** Attachment added: "Log from /var/log/dist-upgrade/main.log"
https://bugs.launchpad.net/bugs/1536910/+attachment/4554450/+files/main.log
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https://bugs.launchpad.net/bugs/1536910
Title:
Upgrading from 14.04 to 15.04 fails on calculating upgrade
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