After upgrade Ubuntu would only boot readonly.
1. First check to see the uuid entered in /etc/fstab:
cat /etc/fstab revealed that the original uuid was different then the current uuid
2. Check to see what the current UUID is showing up as:
3. If the UUID does not match, remount the filesystem to the new UUID and change fstab:
mount -rw -o remount UUID=6ccc9680-2706-41e1-896a-b347cab0ba7e /
vi /etc/fstab to replace the UUID
By: Timothy Conrad