** Description changed: Test Case --------- 1) add this PPA to your system 'sudo add-apt-repository ppa:oibaf/graphics-drivers' 2) run 'sudo apt-get update; sudo apt-get dist-upgrade' 3) try to upgrade to Cosmic 4) Observe the following message: - "Could not calculate the upgrade + "Could not calculate the upgrade An unresolvable problem occurred while calculating the upgrade. - This can be caused by: - * Upgrading to a pre-release version of Ubuntu - * Running the current pre-release version of Ubuntu - * Unofficial software packages not provided by Ubuntu + This can be caused by: + * Upgrading to a pre-release version of Ubuntu + * Running the current pre-release version of Ubuntu + * Unofficial software packages not provided by Ubuntu - If none of this applies, then please report this bug using the + If none of this applies, then please report this bug using the command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal." - With the version of the package from -proposed you should instead see: + With the version of the package from -proposed you should instead see + the following in the error message: - "" - + "If none of this applies, then please report this bug using the + command 'ubuntu-bug ubuntu-release-upgrader-core' in a terminal. If + you want to investigate this yourself the log files in + '/var/log/dist-upgrade' will contain details about the upgrade. + Specifically, look at 'main.log' and 'apt.log'." Situation =============== As more-or-less usual, my attempt to upgrade from 16.04 to 18.04 failed with "Could not calculate upgrade" error (well, one even more confusing and less google-able, as translated to my national language). Also, as usual, I found myself confused, without any pointers what to do next. I tried a few times, tried googling, to no success. It took me switching to LANG=C (to see more googlish error messages) and about 20 minutes of scanning various forums until I found suggestion to check /var/log/dist-upgrade There I found some rather cryptic remark about unresolvable cyclic dependency which may be caused by held packages, which nevertheless inspired me to look for a way to find held packages. A few more minutes of googling and I found out about apt-mark showhold which nicely listed my few held packages (nvidia-304 and some related, IIRC results of driver problems I resolved 2 years ago). I removed those packages and now my upgrade is progressing. But whole experience was very unpleasant. Suggested changes (tiny changes but with large impact) ====================================================== 1. Whenever do-release-upgrade fails, it should suggest checking out /var/log/dist-upgrade. Simply, instead of finishing with "Could not calculate the upgrade. Unresolvable error happened." finish with "Could not calculate the upgrade. Unresolvable error happened. Technical logs of failed upgrade can be found in /var/log/dist-upgrade" This very sentence would save me at least 2 hours. 2. In case upgrade calculation fails due to held or unofficial packages, either list problematic packages, or suggest commands which will list them. For example, my very case would be resolved in a minute if installer printed something like: Note: upgrade calculation could be caused by held packages: nvidia-304 nvidia-304-dev nvidia-current-updates (consider removing those packages temporarily to resolve the problem) or Note: upgrade calculation could be caused by held packages (use apt-mark showhold to list such packages on your system, and consider removing them temporarily to resolve the problem)
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1771387 Title: Could not calculate upgrade should suggest log location To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1771387/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
