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No worries, dude! It sounds like grub is not installed or configured properly. When you reinstalled Ubuntu, did you create a new partition for it or did you install over the old one? Also, did you see any error messages during the installation process?
To fix the "unknown filesystem" error, you'll need to boot into a live USB and reinstall grub. Here are the steps:
1. Boot into the live USB and open up a terminal.
2. Run the command:
sudo fdisk -l
. This will show you a list of all the partitions on your hard drive.
3. Identify the partition that contains Ubuntu. It should be labeled "Linux" or "Ubuntu" or something similar.
4. Mount the partition by running the command:
sudo mount /dev/sdaX /mnt
. Replace X with the number of the partition you identified in step 3.
5. Run the command:
sudo grub-install --root-directory=/mnt /dev/sda
.
6. Run the command:
sudo update-grub
.
After that, reboot your system and see if it works. Let me know if you have any other questions or if this doesn't work, dude.