My problem is probably solved, I wrote "probably" because during the procedure I can saw few errors which I can't explain, so we'll see.
I use the first method from the "linuxconfig.org/ubuntu-boot-repair", im my second PC I disconnected boot HD, then installed Boot-Repair, pressed "Recomended repair" and restarted Ubuntu 20.04 and Grub menu appeared. So far so good.
Then I made an experiment, I installed Ubuntu 20.04 with boot HD unplugged on my old Hitachi 2.5' HD using fresh iso image downloaded fron Ubuntu download section, prepared new USB bootable pendrive using BalenaEatcher, started Ubuntu and again Grub menu wasn't visible.
So I installed Boot-Repair repaired procedure as above, saw a few errors and I can see Grub menu again. Now everything works, so may my method could be helpful.
Looks like delete is impossible too?
My problem is probably solved, I wrote "probably" because during the procedure I can saw few errors which I can't explain, so we'll see.
I use the first method from the "linuxconfig. org/ubuntu- boot-repair" , im my second PC I disconnected boot HD, then installed Boot-Repair, pressed "Recomended repair" and restarted Ubuntu 20.04 and Grub menu appeared. So far so good.
Then I made an experiment, I installed Ubuntu 20.04 with boot HD unplugged on my old Hitachi 2.5' HD using fresh iso image downloaded fron Ubuntu download section, prepared new USB bootable pendrive using BalenaEatcher, started Ubuntu and again Grub menu wasn't visible.
So I installed Boot-Repair repaired procedure as above, saw a few errors and I can see Grub menu again. Now everything works, so may my method could be helpful.
swnw