https://qgis.org/en/site/forusers/alldownloads.html#id16
sudo nano /etc/apt/sources.list
- Copy and paste both lines
Change bionic
by xenial
depending the version of your ubuntu
https://qgis.org/en/site/forusers/alldownloads.html#id16
sudo nano /etc/apt/sources.list
Change bionic
by xenial
depending the version of your ubuntu