This was just brought to my attention so I took a look at the source- code. Thanks to oldfred's comment #20 showing part of the installer log that helps isolate the source-code responsible.
It looks like this is a result of this code - written in 206 - assuming a debconf entry that is empty and in consequence choosing a default device. Adding some debug prints into the code might confirm that and allow it to be fixed. See specifically line 45 in grubinstaller.py (Python code) https://git.launchpad.net/ubuntu/+source/ubiquity/tree/ubiquity/components/grubinstaller.py#n45 Calling misc.grub_default() from: https://git.launchpad.net/ubuntu/+source/ubiquity/tree/ubiquity/misc.py#n370 -- 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
