我从可启动的 USB 启动盘加载了 Ubuntu 并运行
fsck /dev/sda
输出为
fsck from util-linux 2.31.1
e2fsck 1.44.1 (24-Mar-2018)
ext2fs_open2: Bad magic number in super-block
fsck.ext2: Superblock invalid, trying backup blocks...
fsck.ext2: Bad magic number in super-block while trying to open /dev/sda
...
Found a gpt partition table in /dev/sda
并且该过程以错误代码 8 结束。现在下一步该做什么？