I believe the bug is in this function https://git.launchpad.net/ubuntu/+source/ubiquity/tree/ubiquity/plugins/ubi- partman.py?h=applied/ubuntu/impish#n797 (I may have selected the wrong branch here but the same code is present in the 21.10 live CD).
I reported #1591352 when I was in high school and since then I have gotten a degree in CS and started a career in SE. Over the last 6-7 years I have periodically seen comments on this bug report and it's crazy it hasn't been fixed yet. In my debug log I submitted in 2016, it contains the line "No active iterator for grub device entry." which means it was unable to use the user's selected grub device entry. That function then goes on to select the current disk ID... and promptly bricks all of our systems. I tested with 21.10 in a VM and the same thing still happens. A GTK issue shouldn't brick our systems but here we are. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1396379 Title: installer uses first EFI system partition found even when directed otherwise To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1396379/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
