I was trying to install jellyfin and gave up half way through because I kept encountering an error I then rebooted my server and now when I try to install anything or update it I get this error
E: Malformed entry 1 in list file /etc/apt/sources.list.d/jellyfin.list ([option] no value) E: The list of sources could not be read.
/etc/apt/sources.list.d/
thus that file has been added by someone withsudo
privileges onto your system. They've however added an incorrectly formatted file, which has an error on line 1 of the filename provided in the message. That line causes subsequent lines to not be read (error is treated as end-of-file) so further errors may exist; but we can't see that file unless provided. Edit & correct that file. – guiverc Sep 28 '23 at 23:04