@sm-xcx I just updated from 16.04 to 24.04 today. The one thing that sticks out to me is that it shows zero signal strength for both VOLTE signal and Wi-Fi signal. As soon as I make a phone call some signal strength appears (but I think it is switching to 2G). Wi-Fi is odd too: it might show zero signal strength, but when I go to Wi-Fi settings and choose my home Wi-Fi network, the signal strength comes back. It is enough for me to wonder if it is using Wi-Fi, so I plugged in an ethernet adapter before accessing the internet.
There was also a bit of sluggishness. I noticed it earlier when I went to System Settings, then System Information, then Check for Updates, then tried to return to System Settings, and the settings just froze. However, on subsequent tries it is working normally.