failed to calculate upgrade
51768
Could not calculate the upgrade, what happened?
65099
Unable to install any updates through update manager/apt-get upgrade
129101
Upgrading Ubuntu 9.04 to 9.10 when Update Manager doesn't let you
134530
Can I look at the upgrade log after a distribution upgrade?
16837
Unable to upgrade from 14.04 to 14.10 "Cannot Calculate Upgrades"
36529
How to revert an update?
20751
Problem upgrading Ubuntu 9.10
132316
How can I find out what went wrong with a failed Windows update?
100135
What does "upgrade to 18.04" mean?
110148
Why does `do-release-upgrade` skip a version?
81570
What does `--frontend` do in `do-release-upgrade` and where can I find the list of possible values?
42634
How do I upgrade to the development release (aka. Ubuntu+1)?
93942
How to fix "Failed to download repository information" error while updating?
48809
"The upgrade has aborted" error, how to proceed?
76241
"no public key available" while upgrading using update-manager
28040
Windows 8 Upgrade Failed - No Error Info
87163
Error computing sum of sum of digits