Install Skype from repository

<?php
$URL="https://raw.githubusercontent.com/panticz/installit/master/install.skype.sh";
echo "wget $URL -O - | bash -";
echo "

";
$c = curl_init();
curl_setopt($c, CURLOPT_URL, $URL);
curl_setopt($c, CURLOPT_RETURNTRANSFER, 1);
echo htmlspecialchars(curl_exec($c));
curl_close($c);
echo "

";
?>

Fix upside down webcam
<?php
$URL="https://raw.githubusercontent.com/panticz/scripts/master/fix_skype_upsidedown_webcam.sh";
echo "wget $URL -O - | bash -";
echo "

";
$c = curl_init();
curl_setopt($c, CURLOPT_URL, $URL);
curl_setopt($c, CURLOPT_RETURNTRANSFER, 1);
echo htmlspecialchars(curl_exec($c));
curl_close($c);
echo "

";
?>

Install with snap
sudo snap install skype --classic

Disable "contacts comes online" notification
# Notify
sed -i 's|1|0|g' /home/${USER}/.Skype/*/config.xml
sed -i 's|1|0|g' /home/${USER}/.Skype/*/config.xml

# Sound
sed -i 's|1|0|g' /home/${USER}/.Skype/*/config.xml
sed -i 's|1|0|g' /home/${USER}/.Skype/*/config.xml

Links
https://www.linuxbabe.com/ubuntu/install-skype-ubuntu-18-04-lts-desktop
http://wiki.ubuntuusers.de/Canonical_Partner - Ubuntu partner repository
http://www.semanticpool.de/hidden-skype-emoticons/ - hidden skype emoticons
https://help.ubuntu.com/community/SkypeTroubleshooting
https://wiki.ubuntu.com/SkypeWebCams