[Bug 1529247] Re: cannot upgrade to 15.04

[dino99]

your log errors:

 DEBUG failed to SystemUnLock() (E:Not locked)

2015-12-25 08:25:53,093 DEBUG need_server_mode(): run in 'desktop' mode,
(because of pkg 'ubuntustudio-desktop')

Please copy/paste the output of:
cat /etc/apt/sources.list

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1529247

Title:
  cannot upgrade to 15.04

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

Bug description:
  cannot calculate the upgrade

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: ubuntu-release-upgrader-core 1:0.220.8
  ProcVersionSignature: Ubuntu 3.13.0-74.118-lowlatency 3.13.11-ckt30
  Uname: Linux 3.13.0-74-lowlatency i686
  NonfreeKernelModules: wl
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: i386
  CrashDB: ubuntu
  CurrentDesktop: XFCE
  Date: Fri Dec 25 08:27:42 2015
  InstallationDate: Installed on 2013-10-25 (790 days ago)
  InstallationMedia: Ubuntu-Studio 13.10 "Saucy Salamander" - Release i386 (20131016.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to trusty on 2015-12-25 (0 days ago)
  VarLogDistupgradeTermlog:
   
  mtime.conffile..etc.update.manager.release.upgrades: 2015-12-24T14:46:50.791522

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