- Kubuntu 25.10
- Kubuntu is currently installed
- NOT dual-boot
- KDE Plasma 6.4.5
Setting up grub-efi-amd64-signed
Mount is denied because the NTFS volume is already exclusively opened.
The volume may be already mounted, or another software may use it which
could be identified for example by the help of the 'fuser' command.
(dpkg errors removed for space, I apologize in case this isn't proper form)
grub-efi-amd64-signed
shim-signed
Error: Sub-process /usr/bin/dpkg returned an error code (1)
Trying sudo apt-get install grub-efi does the same thing... apparently it's not fully installed. I don't understand what the fuser -l command is supposed to tell me.
So then I tried sudo grub-install and it gave me this:
grub-install: error: /boot/efi doesn't look like an EFI partition.
This is where I'm baffled, because it should definitely be an EFI partition and I've upgraded before, and it definitely exists with /boot/efi/EFI.
Other help topics have suggested a mount command, but it doesn't work because:
Mount is denied because the NTFS volume is already exclusively opened.
The volume may be already mounted, or another software may use it which
could be identified for example by the help of the 'fuser' command.
So I'm completely lost. In case it helps, I got to this point starting from grub not wanting to install because of the NTFS volume exclusively opened part and following at least a dozen help topics to no avail. One of the topics was to try purging grub, but it didn't help and caused extra dpkg errors where I removed it for space, but it was giving a dpkg error even before purging grub. If you help, can you explain the intended effect of the commands as well? Like fuser, I don't really understand what it was supposed to help me with. But the problem seems to be that it's not recognizing /boot/efi for some reason.