Hello,
Simple Question(s)
What is the easiest way to upgrade from KiCAD 5.0 to 5.1 on a Linux Ubuntu (Lubuntu) PPA install?
Do I need to uninstall KiCAD and reinstall with the new PPA?
Can I just “overwrite” the old with the new PPA?
Do “Libraries and additional packages” need to be uninstalled individually? Overwritten?
More if you care 
Need to upgrade a Linux Lubuntu 18.04 PPA install of KiCAD 5.0.2 to KiCAD 5.1.2 for the JFET support in the EESchema GUI. I have a few libraries installed that I would like to keep but no significant confiuguration changes.
I would be willing to delete it all and start from scratch with the new PPA if that is needed. When I see things mentioned in other migration paths, I am not sure if they are required for this upgrade method…
CAUSE FOR CONCERN
Migration from legacy nightly build
Users of the legacy nightly build have to remove KiCad packages before trying to install version 5.0. The legacy nightly build will be always newer than version 5.0. To remove the legacy nightly build:
sudo apt-get remove kicad kicad-footprints kicad-libraries
sudo apt-get remove kicad-symbols kicad-templates kicad-packages3d
sudo apt-get remove kicad-doc-* kicad-locale-*
sudo add-apt-repository -r ppa:js-reynaud/ppa-kicad
AND ALSO
Libraries and additional packages
If you want KiCad libraries you have to install the following packages:
kicad-libraries: a meta package for all libraries
kicad-symbols: All symbols (installed by default)
kicad-templates: Project templates (installed by default)
kicad-footprints: All footprints (installed by default)
kicad-packages3d: 3D for footprints (installed by default. Could be heavy to download)
kicad-demo: demonstration projects (not installed by default)
kicad-doc-XX: documentation. Replace XX by your language code ('fr' for French for instance)
kicad-dbg: debug symbols. Usefull for bug tracking and developpers (not installed by default. Could be heavy to download)
FOUND AT
Do these need to be uninstalled? Overwritten?
I need that JFET support but if this upgrade will kill a working KiCAD / EESchema installation, it might not be worth it. So I am proceeding carefully so I don’t break anything…
Any guidance on this expanded “simple question” would be appreciated. Thank you!