Hi! This issue was resolved in another thread, here: Setting up the new lightening in linux mint or ubuntu
Can you try installing with the commands the user “tkhara” used:
sudo dpkg -i ~/Downloads/local-5-0-6-linux.deb
sudo apt-get install -f
And let us know if it works for you? Note: you may need to change the path to the file.
Thank you,
Megan