Thanks for the response.
I removed spotweb and it upgraded...
After upgrade network did not work because it was changed from eth0 to ens32,
changed it in etc/network/interfaces and then the network worked again (could
this be scripted in the upgrade if you have only one network card). Other
pro
Public bug reported:
did a sudo do-release-upgrade
started but ended with the message An unresolvable problem occurred while
calculating the upgrade.
1) lsb_release -rd
Description:Ubuntu 14.04.5 LTS
Release:14.04
2) upgrade to 16.04
3) Expected the system would upgrade
4) message
