After installation of Anaconda3 and rebooting, GUI login fails.
Find the line
# added by Anaconda3 installer
# export PATH="/path/to/anaconda3/bin:$PATH"
Replace with
# added by Anaconda3 installer
# If not running interactively, don't do anything
# This is required, otherwise error at KDE login
# "Could not start D-bus. Can you call qdbus-qt5?"
[ -z "$PS1" ] && return
[[ ":$PATH:" =~ ":/path/to/anaconda3/bin:" ]] || PATH="/path/to/anaconda3/bin:$PATH"
Source:
The response by bscipio on this Github issue