It seems 1.3.6 has problems with Linux, or at least with Debian.
I would recommend to go back to 1.3.5 until this is sorted.
I reckon you know how to do that, but just in case you don’t, it’s simple :
1°) open terminal and enter : “sudo apt-get remove --purge insync*”
2°) go to your “home”, show hidden files (that is Ctrl +H), find .config and delete the “insync” folder inside of that .config.
Then download the correct 1.3.5 version from this link :
When a file or folder is not deleted successfully locally, Insync now presents an 'Actions Required' error where the user can opt to locate the file (e.g. in order to inspect it) or retry deleting (e.g. after permissions are fixed).
Fixed "'NoneType' object has no attribute 'mtime'" errors.
Fixed "GDAdder object has no attribute '_md5'" errors.
(Windows) System files and folders are now being ignored. This also fixed the issue of Recycle Bin folders being synced.
And reinstall it.
Not sure you’ll be able to go back to where you were and maybe a new sync will be needed