SecureBoot was enabled when I installed Kubuntu and Windows months ago and GRUB was seemingly fine. However recently I needed to run memtest86+ and I...
A first user in Debian is not automatically a member of the sudo group so can not do anything which needs root permissions. However that user can be...
Go to the boot repair page at the link below from one of your functioning installs and use the 2nd option explained on that page as it is more up to...