I've upgraded my Volla from 16.04 to 20.04 with the installer. Here are my observations:
- Upgrade was easy and there were no problems with installing.
- With the first boot, the introduction/first start screen (Welcome to 20.04...) came up.
My first SIM-card is PIN-protected and the system doesn't ask for the PIN automatically anymore. Now I have to unlock the card manually from the indicators. The second card (without PIN) works fine. The System is asking for the PIN-Code automatically.
- GPS is working with uNav.
- Calls (in/out) are working.
- WIFI is working.
- Cellular data is working (but only with SIM1).
- Flashlight is working. You can use the flashlight now with the app "uTorch", too.
- Automatic screen dimming is working.
- Camera is working (photo and video).
Hotspot can be activated, but the device which wants to use the hotspot doesn't get an IP-address. Hotspot is working.
- Shutdown/Reboot from the indicator is working.
- Updates through WIFI are working.
- Battery-life seems to be like under Xenial.
- OSD (e.g. volume up/down) is working.
- Fingerprint is working.
I'll update this post if I realize any changes.
Update 26.12.2022: I've switched the phone to the 20.04 RC-channel and resetted the device using the "Erase & Reset All"-Option under system-settings.
Update 05.01.2023: I've switched to devel-channel.
Update 29.03.2023: I've made a fresh install of 20.04 stable OTA-1 via the installer with "wipe"-option
Update 01.08.2023: Update to OTA-2 via System-Settings