Andy did not say "a few years" in those words in that interview. When making such statements, please do link to the exact source (e.g timestamp in the video) and not just to a 1h22 long interview and leave everyone to find the source of the quote on their own. Please use correct quotes.
For anyone looking for it, it is around the 42min mark:
Andy mentioned "sooner or later" and that Drive is essentially harder than bringing VPN to Linux.
Andy explained well with technical reasons why Linux is challenging (different filesystems, kernel differences, different file browsing experiences, different desktop environnments as example) and mentioned he could see an Ubuntuy version in probably in the next ~24 months. To get to a state where he can comfortably say that the main Linux distributions are 90% supported could take essentially longer. He also mentioned that he wants to get something out there for Drive users in the next year or two.
I need to look at that video (thx for the time marker). So my comment may miss his point.
If Linux is so hard, I wonder how Tresorit manages it quite nicely across multiple distros. They use fuse to mount the remote repository.
And the file attributes on files/dirs have a standardised API via libc and kernel syscalls. This is needed for the sync capabilities, to have data locally and in Drive. These APIs are identical across all distributions and are file system agnostic. Otherwise the tar command would have had a really hard challenge to be so widely useful for both file distribution as well as backups.