I am new to Ubuntu (I have Ubuntu 18.04) and I have tried to install Texstudio for three days, but I have always had problems. I have tried EVERYTHING what I found on the Internet, but NOTHINGS works. I feel really hopeless. Can you help me to remove everything related to LaTeX (because I am not sure that I uninstall everything - Texmaker, Texstudio, Texlive and Miktex) and to install Texstudio, please? I know how to use terminal. Thank you very much.
Delete all TeXLive and TeXStudio which you have installed so far with
sudo apt remove texlive-full sudo apt remove texstudio
Then run in a terminal:
chmod +x ./install-tl-ubuntu
this will take some time ... After that
sudo apt install texstudio
Now you can start TeXstudio from the menu. You can update your TeX distribution by running
sudo tlmgr --self --all update
If you want get rid of the sudo then run
sudo chown -R <USER> /usr/local/texlive
Then you can run all as user which simplifies some things.