Schematics page "ready" but it does not appear

Hi all, I think i have a problem. I left version 7 for the 8.0.8, that I installed using commands in the terminal. Installation ok, apart Schematics page, that the system says it is ready, but it does not appear to work on it. All other PCB, Symbols, Gerber, etc. work ok, only Schematics has a problem.
On version 7.0 everything worked properly. I tried to unistall version 8.0.8 and to install it again. Nothing changed. Does anyone have an idea how to solve this problem?
Thank you in advance for your precious support
paperino204
Kicad v. 8.0.8
Ubuntu 22.04 LTS

I think you need to be a bit more precise.