This also happened to me, the GSM part disappeared.
The solution for two devices after this flawed update was.
Reinstall help PC - usb ubports-installer

Personally, the GPS works, but it is unreliable, wifi must not be turned off and sometimes the phone must be completely restarted.
then sometimes it takes minutes or tens of minutes for the GPS to find the location

https://www.youtube.com/watch?v=L5-TtUnIgbg

I guess it depends what server you want to connect to
for anonymity it would be
https://open-store.io/app/hideme.eventure
add custom installation from linux then
in settings via Libertine and in the created container then try to add linux program ( personally I have no need so experience )

in the network settings ( wifi ) there is a VPN setting ... can't you use that ?
easier than installing external
otherwise add-ons here : https://open-store.io

Hello
I can confirm
( I use airplane mode to redirect calls to another phone number )
After setting the mode the airplane switches after 1 or several rings
( i.e. it does not switch immediately after setting the airplane ... but after some activity )

Calendar problem

originally did not sync .
So I tried uninstalling and reinstalling
Unfortunately, it can no longer be installed.
Now tested with OTA-8

I did a Reinstall without deleting user data and it stayed pretty much the same.
Tried wiping /cache and /tmp and it didn't help either

problem :
used by the system
they compare with other redmi note 7
used by the system much (many times larger)
How to clean??

problém : Používá systém, porovnávají se s jinými poznámkami redmi 7 používanými systémem mnohem (mnohokrát větší) Jak čistit??

I'm just guessing can you run the installation like on a PC or is it fully automatic?

From what did you install ?
directly https://ubuntu.com/download/server/arm ?

if so, then when installing Ubuntu in the step of selecting the disc you can set ( change ) the size of /

My problem with the gallery ( displays only black squares ) was solved by playing the new system installation over the usb cable
(20.04 )