Release notes:
- Linux: Remove the use of apt-key in deb builds
- Add handling for file permission errors when syncing from cloud to local in some cases
- Optimize the handling of cloud/local updates containing a huge number of files
- Add .dropbox and .dropbox.attr files to list of files ignored by default
Debian Buster and later
Debian Stretch
Debian Jessie
Ubuntu 20.04 and later
Ubuntu 18.04 and below
Fedora 31 and later
Fedora 30
Fedora 29
Fedora 28
Fedora 27