Hello,
Please note that apt-key has been deprecated for a while and apt is now complaining every time it finds stuff into /etc/apt/trusted.gpg.d
it's appropriate to update the support page to instruct all debian users to copy the proper key into /usr/local/share/keyrings (you have to create this directory),
then update the interested file under /etc/apt/sources.list.d by interposing [signed-by=/usr/local/share/keyrings/TeamViewer2017.asc] between the "deb" keyword and the repository address.
Thank you for cooperation
