Beginner with Ubuntu XFCE. Missing some applications?

[NicoD]

@haste

That works, but it only works after I’ve logged into Ubuntu with my account first

Hi. I once made a tutorial on how to do that.

Remote Desktop with X11VNC

This is for Armbian with lightdm installed. But it’s just the same for Ubuntu.
Replace lightdm with the display manager that’s used by your Ubuntu. I don’t remember what they use, but possibly it is lightdm.

That makes vnc start when the login screen is shown. So you can log in via x11vnc.

@haste

Also when I want to install TeamViewer, I download the Ubuntu version from their site (.deb), but after it asks me what I want to do with the file. There’s no ‘install’ option.

You probably have downloaded a x86/amd64 .deb file. You need an arm64 installer for that. I’ve never used TeamViewer on an SBC. I don’t know if it works.