Easiest workaround is to use gparted or similar to remove the EFI/boot flag on existing EFI partitions before the install.
On Sun, 10 May 2020 at 19:55, Christian Nassau <[email protected]> wrote: > I think I have just been hit by that bug too: fresh install of (X)Ubuntu > 20.04 on a new computer with a new SSD, which also happened to have an > old HDD with an existing EFI boot paritition. I chose the "expert" > option for the partitioning dialog in install and explicitly specified > the new SSD as the intended boot device. The install used the existing > EFI on the old HDD instead. > > Recovering was not easy (with hindsight there might have been better > options): I physically removed (!) the HDD, installed a 2nd copy of > Ubuntu 20.04 on a new separate partition on the SSD, again in "expert > mode". During installation I was warned that there was no EFI partition > and the system would be unusable, so I manually created an EFI partition > for /boot/efi on the SSD. I then replaced the relevant lines in > /etc/fstab of the first attempt with the correct ones from the 2nd. > After a succesful reboot into the fixed system I added the old HDD again > and manually ran "apt-get --reinstall install grub-common os-prober > grub-efi-amd64" to rescan the HDD for extra grub entries. > > To prevent others from running into this problem it would make sense to > add another warning to the "expert" install process: there already is a > check for the existence of at least one EFI partition in the system - > this check should also warn if the EFI partition is not on the device > that the user has explicitly selected for the boot loader. > > -- > You received this bug notification because you are subscribed to the bug > report. > 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 > -- Tim Richardson -- 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 [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
