Since you say that you can't boot Ubuntu up on your computer without the newer mainline kernels, but Ubuntu does not supply those kernels, I will assume you used some boot parameter or another less than desirable workaround for the issue until you installed the mainline kernels after installing Ubuntu.
I am running mainline kernels on my laptop because of the wireless chip (rtl8723be). With the LTS (4.15.xx.xx) kernels, it has weak WiFi signal reception by default, but it is sort of remedied by passing a parameter (rtl8723be.ant_sel=1) in the appropriate line of /etc/default/grub before splash. However, that then leads to the same problems with Bluetooth (can't play any sound through a Bluetooth speaker unless it's touching a part of the laptop near the antenna). That issue is solved in newer mainline kernels. I also need another parameter to boot the laptop properly, even with mainline (iommu=soft). I am saying this as an example in case you didn't use boot parameters, but would be willing to try (better back up in case you don't get the right parameter on the first try, since there is a small chance that files regarding the boot sequence will get corrupted, had to reinstall because I tried to see if the newer kernels did not need iommu=soft, after the third try some boot files were dead, but /home was fine). Tl;dr I have reasons to run mainline. The way I got past it was to temporarily boot into the default kernel for Ubuntu (LTS), got right up to the router because I couldn't be bothered to type the parameter in, removed all of the mainline kernels (tried with them there, but grub still threw a hissy fit), went through with the upgrade, reinstalled the newest kernel from UKUU, restarted with that kernel and patted myself on the back. I hope this helps! (Newbie commenter prays that it's not too long for whatever policy there might be for comments.) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1788630 Title: package grub-efi-amd64 2.02-2ubuntu8.3 failed to install/upgrade: installed grub-efi-amd64 package post-installation script subprocess returned error exit status 1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub2/+bug/1788630/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
