Fixing Discord Tray on Ubuntu 18.10

On my Ubuntu 18.10 installation, I had a peculiar problem. While Discord did work, it didn't appear in the tray. Not broken enough to warrant immediate action, but broken enough to annoy me.

A quick search on Internet narrowed the culprit to unset desktop environment variable. Simply setting XDG_CURRENT_DESKTOP environment variable to Unity fixed the issue altogether.

Armed with that knowledge, I first modified the application launcher for both desktop and startup:

sudo sed -i 's^Exec=/usr/share/discord/Discord^Exec=/usr/bin/env XDG_CURRENT_DESKTOP=Unity /usr/share/discord/Discord^' \
/usr/share/discord/discord.desktop \

To propagate the change, a quick update of desktop database was in order:

sudo update-desktop-database

Followed by termination of the existing Discord instances:

killall Discord ; killall Discord

Once I started Discord again, its icon appeared in its rightful place.

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