I can't seem to upgrade to Ubuntu 18.04 from 17.10. It can't calculate changes.

[Rob Frohne]

Could not calculate the upgrade

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 disabled all repos except canonical.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: ubuntu-release-upgrader-core 1:17.10.10
ProcVersionSignature: Ubuntu 4.13.0-36.40-generic 4.13.13
Uname: Linux 4.13.0-36-generic x86_64
ApportVersion: 2.20.7-0ubuntu3.7
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity:Unity7:ubuntu
Date: Fri May 4 08:17:22 2018
InstallationDate: Installed on 2017-04-21 (378 days ago)
InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to artful on 2018-05-04 (0 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Nils Fenner (nilsfenner)]

Originally I tried to upgrade from Lubuntu 16.04 (upgraded to 17.10 after this didn't work -> same behaviour on both).

[Rob Frohne (frohro)]

So tonight I did $ apt update, and it said there were 3000 some updates, so I did $ apt upgrade and now it is installing bionic. So now this bug no longer affects me. I did try a $ do-release-upgrade recently before this, and it claimed the upgrade couldn't be computed as usual.

[Rob Frohne (frohro)]

It was a bit painful cleaning up the mess in Ubuntu 18.04. I couldn't resolve the unmet dependencies issues after apt removed about half the packages on my install. I ended up reinstalling without formatting, and adding the packages I wanted afterwards.

[Nils Fenner (nilsfenner)]

FYI: Situation did not change for me. Currently running 17.10 as an intermediate step. (Anyway I like the new LXQt experience on Lubuntu. :) )

[ԜаӀtеr Ⅼарсһуnѕkі (wxl)]

From what I'm understanding here, the OP, Rob, resolved his issue, which centered around Ubuntu Desktop, so for all intents and purposes, this bug should be considered invalid, given those particular requirements.

The other affected party, Nils, seems to be dealing with Lubuntu. I cannot reproduce this issue. Using a fresh VM, for both Artful and Xenial, I installed and let it upgrade like normal. Then I upgraded¹. No problems.

That said, for Lubuntu, I can only conclude that something about your system is inconsistent with a standard system. One thing to note here is that at no point has LXQt been included as part of an official Lubuntu release. That could potentially lead to the issues you're facing. Perhaps we could investigate further, but not without additional information. I would suggest filing a new bug, again with `ubuntu-bug ubuntu-release-upgrader-core`. Hopefully it's not too late that we can't get any useful information from it.

¹ Until the first point release, LTS→LTS is not supported through ubuntu-release-upgrader, but requires using `do-release-upgrade -d`.

[Nils Fenner (nilsfenner)]

Walter, thanks for the reply! The issue is still present for my system, built upon on a stable, yet customized version of Lubuntu 16.04.

> I would suggest filing a new bug, again with `ubuntu-bug ubuntu-release-upgrader-core`.

Not sure I have done that before I stumbled about this issue here. Will definitely repeat this step just in case!

Further I dug a bit into the logs and actually found something that might point to the problem here:

--- from dist-upgrade log ---
…
2018-05-20 13:10:46,069 DEBUG running doUpdate() (showErrors=True)
2018-05-20 13:11:09,777 DEBUG openCache()
2018-05-20 13:11:09,777 DEBUG failed to SystemUnLock() (E:Nicht gesperrt)
2018-05-20 13:11:10,286 DEBUG /openCache(), new cache size 90600
2018-05-20 13:11:10,287 DEBUG need_server_mode(): run in 'desktop' mode, (because of key deps for 'lubuntu-core')
2018-05-20 13:11:11,965 ERROR Dist-upgrade failed: 'E:Fehler: Unterbrechungen durch pkgProblemResolver::Resolve hervorgerufen; dies könnte durch zurückgehaltene Pakete verursacht worden sein.'
2018-05-20 13:11:11,978 DEBUG abort called
2018-05-20 13:11:11,983 DEBUG openCache()
2018-05-20 13:11:11,983 DEBUG failed to SystemUnLock() (E:Nicht gesperrt)
2018-05-20 13:11:13,666 DEBUG /openCache(), new cache size 88071
--- log ends here ---

After filing the bug, I am going to retry the update in 'server' mode or shouldn't I?

[Nils Fenner (nilsfenner)]

Ok, got the upgrade running (same machine as i am writing this message on now). Apparently some "unity" packages sneaked into the system. As I don't need those, I removed them and everything seems to be fine now. However I still don't know what packages exactly are causing this problem. This would be very helpful for users to know. Isn't there a better way to show what actually is causing the problem?

[Rob Frohne (frohro)]

It may be of interest to note that I also was using Unity on Ubuntu 17.10.

[Macpaul Lin (macpaul)]

I've still got this problem even I've removed unity packages
apt-get remove unity
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package 'unity' is not installed, so not removed
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.

2018-06-15 01:49:51,919 DEBUG failed to SystemUnLock() (E:Not locked)
2018-06-15 01:49:52,270 DEBUG /openCache(), new cache size 61872
2018-06-15 01:49:52,271 DEBUG need_server_mode(): can not find a desktop meta package or key deps, running in server mode
2018-06-15 01:49:53,207 ERROR Dist-upgrade failed: 'E:Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.'
2018-06-15 01:49:53,208 DEBUG abort called
2018-06-15 01:49:53,210 DEBUG openCache()
2018-06-15 01:49:53,210 DEBUG failed to SystemUnLock() (E:Not locked)
2018-06-15 01:49:54,371 DEBUG /openCache(), new cache size 57384

[Launchpad Janitor (janitor)]

[Expired for ubuntu-release-upgrader (Ubuntu) because there has been no activity for 60 days.]