Mi issue is the same as other post here https://forum.cgsecurity.org/phpBB3/viewtopic.php?t=8028
briefly I accidentally created a GPT partition table on a Ext4 HD. To recover the Ext4 data I used testdisk on that HD and run the following as suggested by testdisk
$ sudo fsck.ext4 -p -b 32768 -B ...
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- 20 Oct 2021, 10:53
- Forum: Filesystem repair
- Topic: Recovered Ext4 HD not permanent
- Replies: 1
- Views: 7353