It worked.
Thank you very much!
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https://bugs.launchpad.net/bugs/1309596
Title:
Upgrading from 13.10 to 14.04 didn't work
To manage notifications about this bug go to:
Reviewing the files from your upgrade attempt you seem to have enabled
the xorg-edgers-ppa. 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
