HELP ! Sorry if this is the wrong place, it is the closest to my problem: I just upgraded from 24.01 to 24.04 and have only the command page (terminal?) showing, I am an old dog and find most of the terms you are all familiar with a foreign language to me, my screen shows:

Ubuntu 24.04.1 LTS richard-Aspire-XC-115 tty1

richard-Aspire-XC-115 login: richard
Password:
Welcome to Ubuntu 24.04.1 LTS (GNU/Linux 6.8.0-48-generic x86_64)

*Documentation: https://help.ubuntu.com
*Management: https://landscape.canonical.com
*Support: https://ubuntu.com.pro
richard@richard-Aspire-XC-115:~$_


I have tried many LS and CD commands and even some sudo apt, sudo install, all fail although I have had pages of text suggesting alternative commands, but the most relevant answer seemed to me that I do not have an internet explorer type of program (I had Google Chrome on 24.01) and of course attempts to install Google all failed for the same reason.
I did try Ctrl Alt F1 to F6 but nothing changed, and of course I typed my password to login and whenever it was requested and most of the suggestions were for old apps and only variations of the letters I tried.
Please help, I assumed that as an LTS update it would be bug free and did not copy all my files to a memory stick, If I have to install as a new OS I will lose years of docs. photos, music etc.

PS. All text in white on a black screen.