2. Boot from the CD-ROM drive and enter the liveCD mode. First, copy important files and back up the partition table. If you want to back up the partition, you must not use GHOST. GHOST can only work normally on Windows series systems.
3. Then restart from the CD drive. In the selection interface, select the recovery mode. Different versions are written differently, and the overall idea is to repair. Specifically, if you use a Linux workstation, you should be familiar with English and repair it step by step according to the tips of the interface. Generally it can be repaired. If the repair is unsuccessful once, you can try several times.
4. If the repair fails, you need to reinstall the system.