Can't boot into Ubuntu after shrunk /home partition

[cybermyth]

I have dual boot on my laptop with Windows 10 and Ubuntu installed.

I've shrunk the Ubuntu /home partition using Gparted (with live USB). The /home partition was the last partition on the disk (/dev/sda8) and then I've created a new partition from the available space in Windows 10 (now /dev/sda9).

I can successfully boot into Windows 10, but I could only boot into Ubuntu once. Now I am getting a mount /boot/efi problem. But the strange thing is, if I boot into recovery and do anything in there (like delete broken packages), I can boot into Ubuntu normaly from there, but without graphics drivers enabled (if I understand correctly).

More details with added logs here (https://askubuntu.com/questions/968195/cant-mount-boot-efi-after-shrinking-partition-on-dual-boot)

I've ran boot-repair, but it failed. Link to pastebin here (http://paste.ubuntu.com/25832274/)

[efflandt]

It looks like you need to disable Windows "fast boot" which is a form of hibernation that marks its partitions as dirty, so nothing else mounts them and it can resume instead of cold boot.

[cybermyth]

I've disabled fast boot now, but no luck. I've also ran the boot-repair successfuly now, but it didn't help.

Logs here (http://paste.ubuntu.com/25832657/)

[oldfred]

What brand/model system?

You have two Windows entries in UEFI. One is to boot Ubuntu using shim.

Boot0001* Windows Boot Manager HD(2,GPT,51f3571e-2f45-4341-956d-dce2730a1cb3,0xe1800,0x32000)/File(EFIubuntushimx64.efi)WINDOWS



Years ago with early issues with UEFI & systems that only wanted to boot Windows by description renaming the Windows entry to actually use shimx64.efi was common. But Windows would overwrite it, and when Windows turns back on the fast start up or needs chkdsk, then you could not boot from grub and did not have an UEFI entry. So that type of entry is not used anymore.

Most systems with the broken UEFI like HP & Sony will still boot the fallback or hard drive entry at /EFI/Boot/bootx64.efi. So Boot-Repair copies shimx64.efi to the the bootx64.efi. Then you can boot a hard drive entry if you have one. We can add on, but unless description is something UEFI accepts it may not work.

The other option is at end of the Summary Report on editing Windows BCD.

[cybermyth]

MSI

Thanks for the info.. If I understand correctly I need to use bcdedit /set {bootmgr} path \EFI\ubuntu\shimx64.efi to change the default boot entry? I already tried that, but no luck.

[oldfred]

You did not say model.
But often issues are more common by brand as they use same UEFI with just slight changes for each model.

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