On Tue, Mar 15, 2022 at 11:49:10AM +0000, Tim Woodall wrote:
Do you mean a partition table that looks something like this? root@xen17:~# fdisk -l /dev/sda Disk /dev/sda: 931.51 GiB, 1000204886016 bytes, 1953525168 sectors Disk model: Samsung SSD 870 Units: sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disklabel type: gpt Disk identifier: DAD8D524-D8F7-D04D-A21E-C8E14F39285B Device Start End Sectors Size Type /dev/sda1 2048 4095 2048 1M BIOS boot /dev/sda2 4096 264191 260096 127M EFI System /dev/sda3 264192 1953525134 1953260943 931.4G Linux filesystem Then you don't always need the bios boot partition.
Yes, that's the one. Centos refuses to install without it.
IIRC you only need a bios boot to use legacy boot. If you're exclusively EFI (dirac doesn't support anything else) then the bios boot partition won't be used.
It's a very old laptop, BIOS + GTP (on one disk).
IIUC the problem is that grub needs some disk space for legacy boot and the GPT format doesn't have enough unused space for grub to sneek in so it needs an explicit partition reserved for it.
It's mystifies me that Ubuntu on the same disk doesn't need this... Anyway, I realised the reason Centos didn't show up in the boot menu was that it installed GRUB on the other disk to what BIOS boots. sda is a straight BIOS/MBR disk, sdb, which BIOS boots and has Ubuntu & Centos, is a GPT disk. Regards, Henrik Morsing -- GLLUG mailing list GLLUG@mailman.lug.org.uk https://mailman.lug.org.uk/mailman/listinfo/gllug
