Multiple issues - window size and XKB configuration issue

Hello everyone, here are the problems! and thanks in advance for any advice or assistance.

1- Computer Startup Issue: an issue arises as shown in the picture provided.

2- Window Size Problem: The window size is smaller than the screen, and I’ve attempted a command to fix this in the past, but it didn’t work.

3-I received an error message saying “No space left on the device,” but upon checking, the disk has plenty of space available. The error specifically points to a file named “.xsession-error.old.”

4- XKB Configuration Error:
Error activation XKB configuration. There can be various reasons for that.
if you report this situation as a bug, include the results of xprop-root | grp XKB
gsetting get org.gnome.libgnomekbd.keyboard model
gsetting get org.gnome.libgnomekbd.keyboard layouts
gsetting get org.gnome.libgnomekbd.keyboard options

5- Java Error during Comsol Installation: While attempting to install Comsol, I encountered a Java error that prevented the installation process from completing.

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