I managed to clean up the damage I used efibootmgr to delete the EFI boot entries on the Windows drive
I then booted an Ubuntu USB stick, followed Gentoo's guide for mounting and chrooting into the Ubuntu environment I needed to fix https://wiki.gentoo.org/wiki/Handbook:AMD64/Installation/Base I then did grub-install --target=x86_64-efi --efi-directory=/boot/efi, where /boot/efi had my external drive's EFI partition mounted up https://wiki.gentoo.org/wiki/Handbook:AMD64/Installation/Bootloader I checked the drive with efibootmgr to make sure Grub installed right, it did. This is a really critical bug for any desktop user... -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1173457 Title: Ubuntu Installer uses wrong bootloader location for USB UEFI installs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1173457/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
