It'll be hdmi_safe=1 because that stuff is OS agnostic. The hard part with Ubuntu is knowing where they store the active /boot/config.txt. On Ubuntu-MATE 18.04 config.txt is in the main directory of the boot drive. Also, to fix the issue of booting to flashing blank screen (e.g., when using legacy ...

I just installed ubuntu-mate-18.04.2-beta1-desktop-armhf+raspi-ext4 on my RPi-3B and then ran an update post-installation. Everything got updated fine except for linux-firmware-raspi2 ("GPU Firmware & Bootloader for RPi ..." package). I tried the update again using command lines and below were the d...

Thanks for the pointer (--> to right-click on one of the applet icons).

I subsequently discovered that it can also be done the longer way with "Panel Settings"->"Panel Applet"->"Application Launch Bar"->"Preference".

Is there a way to add an app (e.g., Firefox ESR) to the Panel?

TIA.