SUMMARY Plymouth graphical boot doesn't show anymore during startup, after the upgrade to KDE 5.19.0. STEPS TO REPRODUCE 1. Power on your KDE Neon system upgraded to KDE 5.19.0 2. Alternatively, power off your KDE Neon system upgraded to KDE 5.19.0 OBSERVED RESULT The beatiful KDE Neon logo doesn't show anymore, instead we have the text messagges of systemd log. Besides, i have the start menu to choose the OS. It didn't appear before because on this laptop i have KDE Neon only. EXPECTED RESULT Neon logo and no option to choose other non-existing OS should appear at boot, as it was before the upgrade. SOFTWARE/OS VERSIONS Linux/KDE Plasma: KDE Neon 5.19 User Edition KDE Plasma Version: 5.19.0 KDE Frameworks Version: 5.70.0 Qt Version: 5.14.2
Fixed with the command: sudo apt install --reinstall grub-pc File /etc/default/grub was missing and grub-pc recreated it.