[Bug 1769184] Re: I can't seem to upgrade to Ubuntu 18.04 from 17.10. It can't calculate changes.

[Macpaul Lin]

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

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https://bugs.launchpad.net/bugs/1769184

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

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

Bug description:
  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)

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