Missing libappindicator3-1 installing Slack

Question

I had such issue with new version of Debian 11 (2021-09-07).
Here is what I did to install Slack desktop app on Debian.
I will use slack-desktop-4.19.2-amd64.deb file for the example

dpkg-deb -x slack-desktop-4.19.2-amd64.deb unpack
dpkg-deb --control slack-desktop-4.19.2-amd64.deb unpack/DEBIAN

Open the file ./unpack/DEBIAN/control and replace
libappindicator3-1 with
libayatana-appindicator3-1

After that do

dpkg -b unpack slack.deb

Now you should have slack.deb file.

The last step is sudo apt install ./slack.deb

Or you can use below script

#!/bin/bash

package="$1"
name="$(basename ${package} .deb)"

dpkg-deb -x "$package" "$name"
dpkg-deb --control "$package" "$name"/DEBIAN
sed -i -- 's/libappindicator3-1/libayatana-appindicator3-1/g' ./"$name"/DEBIAN/control
new="${name}-debian.deb"
dpkg -b "$name" "$new" 
rm -rf "$name"
sudo apt install ./"$new"

like this:

apt-install-libayatana BreakTimer.deb

Source is here https://github.com/rofrol/dotfiles/blob/master/bin/apt-install-libayatana

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