Public bug reported:
Could not calculate the upgrade
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.22
ProcVersionSignature: Ubuntu 4.4.0-91.114-generic 4.4.76
Uname: Linux 4.4.0-91-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
Cr
i have tried all these replies and nothing worked for me.i was very close to
reinstallation,but
i typed in the terminal :
sudo apt-get install gnome
there was some time installing and then there was a window asking whitch
desktop manager i want to set as a default
i didn't chose neither gnom
