Ttyjfyk

From https://xpra.org/trac/wiki/Usage

This will start an xterm (or any graphical application you want) on
SERVERHOSTNAME and forward it to your desktop:

xpra start ssh/SERVERUSERNAME@SERVERHOSTNAME --start-child=xterm

On my local computer, I want to start a graphical application (e.g. xterm) in a remote computer (192.168.0.154), so I run

$ xpra start ssh:192.168.0.154 --start=xterm
2019-03-11 14:24:57,998 Xpra gtk2 client version 2.1.3-r17247M 64-bit
2019-03-11 14:24:57,998 running on Linux Ubuntu 18.04 bionic
2019-03-11 14:24:58,000 Warning: failed to import opencv:
2019-03-11 14:24:58,000 No module named cv2
2019-03-11 14:24:58,000 webcam forwarding is disabled
Warning: failed to import GStreamer 1.x:
 Namespace Gst not available
2019-03-11 14:24:59,695 Error: failed to query sound subsystem:
2019-03-11 14:24:59,696 query did not return any data
2019-03-11 14:25:01,083 Warning: vendor 'Intel Open Source Technology Center' is greylisted,
2019-03-11 14:25:01,083 you may want to turn off OpenGL if you encounter bugs
2019-03-11 14:25:01,110 PyOpenGL warning: missing accelerate module
2019-03-11 14:25:01,213 OpenGL enabled with Mesa DRI Mobile Intel® GM45 Express Chipset
2019-03-11 14:25:01,311 keyboard settings: rules=evdev, model=pc105, layout=us
2019-03-11 14:25:01,315 desktop size is 1440x900 with 1 screen:
2019-03-11 14:25:01,316 :0.0 (381x238 mm - DPI: 96x96) workarea: 1440x876
2019-03-11 14:25:01,316 monitor 1 (303x190 mm - DPI: 120x120)
t@192.168.0.154's password: 
Warning: cannot use the system proxy for 'start' subcommand,
 failed to connect to '/run/xpra/system':
 [Errno 2] No such file or directory
Entering daemon mode; any further errors will be reported to:
 /run/user/1000/xpra/S27001.log
InitException: failed to identify the new server display!
xpra initialization error:
 failed to identify the new server display!
2019-03-11 14:25:23,810 Error: failed to receive anything, not an xpra server?
2019-03-11 14:25:23,810 could also be the wrong protocol, username, password or port
2019-03-11 14:25:23,810 Connection lost
2019-03-11 14:25:23,812 Error: printing disabled:
2019-03-11 14:25:23,812 No module named cups

I was wondering why the error happens?

Do I need to install xpra on the remote computer, which I have? Do I need to run xpra on the remote computer, which I haven't?

Thanks.