Got stuck on this today after upgrading from 19.04 -> 19.10. I do dual- boot Windows. Also Ubuntu is on a 2-disk mdadm RAID array.
- I couldn't get boot-repair-disk to work: It wouldn't recognize the internet connection. The LXTerminal it comes with was broken too and didn't respond to keyboard input, so I couldn't fix it. - I couldn't install boot-repair from within a live Ubuntu 19.10 USB: It refused because of an unmet dependency for package boot-sav, even though I'd added the recommended PPA. - I did fix it by installing mdadm (sudo apt install mdadm) from within the live Ubuntu USB, reassembling the RAID array (mdadm --assemble /dev/md0 /dev/sda1 /dev/sdb1), mounting it, mounting all the other crap you need to make chroot work, entering chroot, then running update-grub and grub-install a few times on both disks (grub-install /dev/sda1, grub-install /dev/sdb1). -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1848797 Title: After upgrading to 19.10, boot screen shows: "Error: symbol 'grub_file_filters' not found." To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1848797/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
