Since previous topics have been closed already, here is a new one.
On Ubuntu 20.04 there is no system-tray icon of Plexamp. The possible solutions posted in the already closed topics do not solve the above mentioned problem for me.
I already have a desktop file and the launcher icon so i can start it. The problem is that when started, there is no icon in the system tray so i can control plexamp.
Plexamp implements MPRIS, which should mean it’s visible in the OS’s sound menu, and you should be able to control it from there. In terms of a system tray item, I don’t think it’s something that’s likely to be implemented, as system trays aren’t widely supported cross-distro, they don’t work under Wayland, and Gnome for example has removed support entirely.