Unable to calculate updgrade when trying to go from wily to xenail xerus. when commandgrep ERROR /var/log/dist-upgrade/main.log is run result ERROR Dist-upgrade failed: 'E:Unable to correct problems, you have held broken packages.'

[Xuramaz]

when command "grep ERROR /var/log/dist-upgrade/main.log" is run it results ERROR Dist-upgrade failed: 'E:Unable to correct problems, you have held broken packages.'

Cannot find any currently held broken packages

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: ubuntu-release-upgrader-core 1:15.10.14.4
ProcVersionSignature: Ubuntu 4.2.0-36.42-generic 4.2.8-ckt8
Uname: Linux 4.2.0-36-generic x86_64
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: GNOME
Date: Sat May 28 18:18:29 2016
InstallationDate: Installed on 2016-03-12 (77 days ago)
InstallationMedia: Ubuntu-GNOME 15.10 "Wily Werewolf" - Release amd64 (20151021)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to wily on 2016-05-29 (0 days ago)
VarLogDistupgradeTermlog:

[Brian Murray (brian-murray)]

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.