Howdy,
Today is my regular monthly update slot. It seems to correspond with a new release. Sadly there are apt update warnings for the teamviewer repository. Coincidence maybe. My distro is debian Jessie. It maybe oldstable but it is supported to 2020: -
$ sudo apt update
<snip>
W: Failed to fetch http://linux.teamviewer.com/deb/dists/stable/main/binary-amd64/Packages Hash Sum mismatch
W: Failed to fetch http://linux.teamviewer.com/deb/dists/stable/main/binary-i386/Packages Hash Sum mismatch
E: Some index files failed to download. They have been ignored, or old ones used instead
What next please? ...try again tomorrow???