Comment 3 for bug 1447822

 Thank's for help. Yesterday I did same operations:
sudo sed -i 's/utopic/vivid/g' /etc/apt/sources.list
sudo apt-get update
sudo apt-get dist-upgrade
After that I have been upgrade system.
I did something wrong? Would system work correctly?

Четверг, 23 апреля 2015, 21:54 UTC от Brian Murray <email address hidden>:
>*** This bug is a duplicate of bug 1069133 ***
>     https://bugs.launchpad.net/bugs/1069133
>
>Reviewing the files from your upgrade attempt you seem to have enabled a
>PPA that provides Xorg packages. This will prevent the upgrade as that
>PPA contains different versions of packages essential to Ubuntu. The
>page, https://launchpad.net/~xorg-edgers/+archive/ppa , contains details
>on to how to revert to the official Xorg packages for the xorg-edgers
>PPA. Instructions for reverting to official Xorg packages should be
>similar for the PPA that you have enabled.
>
>** Changed in: ubuntu-release-upgrader (Ubuntu)
>       Status: New => Invalid
>
>** Tags added: ppa xorg-edgers-ppa
>
>** This bug has been marked a duplicate of bug 1069133
>   Get upgrade error 12.04 - 12.10 "Could not determine upgrade" - xorg from ppa
>
>--
>You received this bug notification because you are subscribed to the bug
>report.
>https://bugs.launchpad.net/bugs/1447822
>
>Title:
>  don't work update
>
>Status in ubuntu-release-upgrader package in Ubuntu:
>  Invalid
>
>Bug description:
>  i can't upgrade my system from 14.10 to 15.04
>
>  ProblemType: Bug
>  DistroRelease: Ubuntu 14.10
>  Package: ubuntu-release-upgrader-core 1:14.10.10
>  ProcVersionSignature: Ubuntu 3.16.0-36.48-generic 3.16.7-ckt9
>  Uname: Linux 3.16.0-36-generic x86_64
>  NonfreeKernelModules: wl
>  ApportVersion: 2.14.7-0ubuntu8.4
>  Architecture: amd64
>  CrashDB: ubuntu
>  CurrentDesktop: Unity
>  Date: Fri Apr 24 00:35:20 2015
>  InstallationDate: Installed on 2015-04-16 (7 days ago)
>  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
>  PackageArchitecture: all
>  SourcePackage: ubuntu-release-upgrader
>  UpgradeStatus: Upgraded to utopic on 2015-04-23 (0 days ago)
>  VarLogDistupgradeTermlog:
>
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>https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1447822/+subscriptions

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С уважением, Станислав Александрович Стрижаков