My issue was related with blkid having old entries in cache (/etc/blkid.tab) which confused update-grub. Old entries came from my old drive which I recently upgraded. I cleaned the cache (sudo blkid -g), removed menu.lst and run update-grub which created new menu.lst with correct entries.
I can still send whole menu.lst but I think that now it doesn't make sense.
Hello. Problem solved.
My issue was related with blkid having old entries in cache (/etc/blkid.tab) which confused update-grub. Old entries came from my old drive which I recently upgraded. I cleaned the cache (sudo blkid -g), removed menu.lst and run update-grub which created new menu.lst with correct entries.
I can still send whole menu.lst but I think that now it doesn't make sense.