The ext4 hard disk partition has been rolled back for two years, that is, there are no changes in two years. I mounted the partition from under windows 10 using EXT2FSD. Saved there projects from Adobe Premiere. All project files were stored in this section. Recently I decided to copy some files from the NTFS partition to this very EXT4 partition, after which this problem occurred.
The partition itself was used by the xubuntu system. GRUB recently crashed due to a windows update, and I did not restore it.
I decided to boot from under the LiveCD to try to do something with this section, but it is in read only mode and cannot be mounted.
Can I do something to restore the files? On the section are very important files for the project Premiere.