Well I just started using TeXStudio on ubuntu, after having used it for years on windows.
On windows whenever a package is missing TexStudio will ask me to download that package from ctan (if it is available there), however on ubuntu this seems to be missing.
For example a simple documentclass hitec is missing, and it errors without giving me an option to set the search repositories.
texliveonfly. See e.g. https://tex.stackexchange.com/questions/50464/ https://tex.stackexchange.com/questions/291317/ https://tex.stackexchange.com/a/463842/ – Torbjørn T. Jul 29 '19 at 20:13.logfile of any.texdocument you've compiled, it's written in the very first line. – Torbjørn T. Jul 29 '19 at 20:16tlmgr install hitecand it will be installed in texlive. – David Carlisle Jul 29 '19 at 21:07