[78506.185358] sd 5:0:0:0: [sda] Add. Sense: Unrecovered read error -
auto reallocate failedSorry but you have already lost data. Avoid using the disk as it is no longer able to function reliably. Replace it asap. ddrescue is a good tool in these situations. But probably best to re-install from scratch and restore your data from a backup - but from a backup prior to when the disk errors started. Sadly, backups since may have some good data but those backups will contain corrupt files.
Best wishes, Berni -- "Confidence is what you have before you understand a problem" - Woody Allen