I installed 24.04.2 LTS from a USB stick on an older HP laptop. I choose to do a clean install and use the whole existing and only 240 GB drive. Twice I encountered a pop-up window about a "system program problem" (no more info available at the time - I submitted the problem). Installation continued in spite of this. After installing I installed extra drivers following the automatic setup. Then the installation finished, without any more problems. Time to reboot. When rebooting, I see 4 lines saying "Intel ....boot agent ...PXE.. (goes quickly..) Then for 2-3 seconds, a line reading "Initializing and establishing link..." Then two lines: "Non-system disk or disk error" "Replace and strike any key when ready". Not possible to get out of this this. I checked the boot order settings and it starts with USB drive, then "Notebook Drive". Seems OK. I also ran a hardware check on the RAM and the hard drive. No errors were reported.
Then I downloaded "gparted" on another USB stick and checked the partitions on the laptop. Seems OK: sda1 boot_grub, sda2 ext4. This has been set-up by the Ubuntu installer, during installation. Somehow grub is not pointing to the correct partition? Any hints on what to check/do next? Many thanks beforehand for your input!
