I successfully upgraded from Ubuntu 12.04 to 14.04 with sudo do-release-upgrade, and after that with lsb_release -a I received this message:

No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 14.04.1 LTS
Release:        14.04
Codename:       trusty

but after I powered off, I could not boot my system.



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