Can't name the question in other way.
Windows 10 LTSC 1809 (b. 17763.2452). Added the MS Store (LTSC des not contain it by default). Installed WSL and Ubuntu 20.04.
The system runs, but I cant use any programs using screen output other than stdout. Examples: mc, tmux, nano and even pager/less (thus man is also unavailable). Invoking such command results black windows with blinking cursor in upper left
(unsure if the picture visible, bu it contains only the part of window header and white cursor on black background)
The program itsef working, and I can exit it using hotkeys or by other means does not require seeing the output. After that the screen isn't restored and I can see the remnants of program's output - 1st page of man, status bar of tmux, 1st page of pager's output etc. But that output is just a static text in the window.
I had used WSL on my previous job, and never met such problems. Complete WSL removal and re-installaion gave no results