lsblk shows this:
nvme0n1 465,8G ├─nvme0n1p1 vfat 200M /boot/efi ├─nvme0n1p2 ext4 149,8G / ├─nvme0n1p5 ext4 100G ├─nvme0n1p6 ext4 1G └─nvme0n1p7 btrfs 214,8G /media/cip/fedora_localhost-live fedora_localhost-live
This configuration has the following story: on a GPT partition (laptop with UEFI BIOS) first was installed a Windows 10 system at the beginning of the drive. That had created I think three small partitions and a big one. (At the present these have been replaced with the Linux Mint ones.) After installing Windows I have copied a Solus Linux partition from a different drive (without creating a uefi partition; the Solus partition is still present, it is the big one in the middle as shown in gparted); immediately after that I have installed Fedora 34 letting the system to make a default installation, which has created 2 partitions at the end of the drive, the last one
btrfs. For a while I have used Fedora (with its boot loader), Solus and Windows at the same time.
But then I have removed the Windows 10 partitions at the beginning of the drive and in place I have installed Linux Mint. Prompted to create a uefi partition, I have done that too: the Mint partitions are the first two at the beginning of the drive.
Now Linux Mint has installed the grub boot loader and Solus is accessible, but not Fedora. It is absent from the boot list, updating grub or installing Grub Customizer in Mint doesn’t help, Fedora remains absent.
btrfs drive is accessible in Mint and can be mounted, but updating grub doesn’t show Fedora:
sudo update-grub [sudo] password for cip: Sourcing file `/etc/default/grub' Sourcing file `/etc/default/grub.d/50_linuxmint.cfg' Sourcing file `/etc/default/grub.d/init-select.cfg' Generating grub configuration file ... Found theme: /boot/grub/themes/Stylish/theme.txt Found linux image: /boot/vmlinuz-5.4.0-58-generic Found initrd image: /boot/initrd.img-5.4.0-58-generic Found Solus (4.2) on /dev/nvme0n1p5 Adding boot menu entry for UEFI Firmware Settings done
Was Fedora maybe dependent on one of the small partitions created by Windows 10 (which were in place when Fedora was installed)?
Or maybe creating a Linux Mint UEFI partition conflicts somehow with that created by Fedora?
How could I make Fedora visible in the Linux Mint boot loader – or otherwise have a boot loader with all the three Linux systems?