delete live tv and others

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Yes. The account running the server. Could be your account, root (hope not), or -- as the docs state -- a service user (e.g., "jellyfin"). If you've installed on your own account, which is fine, look at your permissions and who owns those folder(s) with ls -l (I like ls -hal). If ownership does not correspond with the account running the Jellyfin server, you need to check whether you have permission as that user to access/modify that location. You can use touch (e.g., "touch test") which will create a blank file named whatever text you follow "touch" with. If it fails, the user in question does not have permission to read/write.