Situation

When Install Slack Desktop Will Get Error

How To Fix

Login To Terminal And Enter These

wget http://ftp.us.debian.org/debian/pool/main/libi/libindicator/libindicator3-7_0.5.0-4_amd64.deb
wget http://ftp.us.debian.org/debian/pool/main/liba/libappindicator/libappindicator3-1_0.4.92-7_amd64.deb
sudo apt install ./libindicator3-7_0.5.0-4_amd64.deb
sudo apt install ./libappindicator3-1_0.4.92-7_amd64.deb

Re Install Slack Desktop App

It’s Work~