cygwin x11 doesn't start after windows 10 upgrade

[Steinar Bang]

>>>>> Marco Atzeri via Cygwin <cygwin@cygwin.com>:

> can you start X11 with startxwin ?
> If you start with just "XWin :0 -multiwindow -clipboard"
> does it work ?

startxwin isn't found:
 sbang@ITEM-S63383:~$ startxwin
 -bash: startxwin: command not found
 sbang@ITEM-S63383:~$ which startxwin
 which: no startxwin in (/usr/local/bin:/usr/bin:/cygdrive/c/Program Files (x86)/Common Files/Oracle/Java/javapath:/cygdrive/c/ProgramData/Oracle/Java/javapath:/cygdrive/c/WINDOWS/system32:/cygdrive/c/WINDOWS:/cygdrive/c/WINDOWS/System32/Wbem:/cygdrive/c/WINDOWS/System32/WindowsPowerShell/v1.0:/cygdrive/c/Program Files/Intel/WiFi/bin:/cygdrive/c/Program Files/Common Files/Intel/WirelessCommon:/cygdrive/c/Program Files/Git/cmd:/cygdrive/c/ProgramFiles/apache-maven-3.6.3/bin:/cygdrive/c/Program Files (x86)/Calibre2:/cygdrive/c/ProgramFiles/GnuWin32/bin:/cygdrive/c/Program Files/nodejs:/cygdrive/c/WINDOWS/System32/WindowsPowerShell/v1.0:/cygdrive/c/Program Files/Java/jdk1.8.0_241/bin:/cygdrive/c/Program Files/PuTTY:/cygdrive/c/WINDOWS/System32/OpenSSH:/cygdrive/d/Profiles/sbang/AppData/Local/Microsoft/WindowsApps:/cygdrive/d/Profiles/sbang/AppData/Local/Programs/Fiddler:/cygdrive/d/Profiles/sbang/AppData/Roaming/npm:/cygdrive/c/Program Files/Microsoft VS Code/bin:/cygdrive/c/Applications/Atlassian/atlassian-plugin-sdk-8.0.16/bin:/cygdrive/d/Profiles/sbang/AppData/Local/Microsoft/WindowsApps:/cygdrive/d/Profiles/sbang/apps/bin:/usr/local/go)
 sbang@ITEM-S63383:~$

I thought it might be because xorg-scripts wasn't installed, so I
installed xorg-scripts 1.0.1-1, but it didb't make startxwin appear.

I *do* have xorg-server 1.20.5-3 installed (and it was working until a
couple of days ago).

startxwin is supposed to be installed with xorg-server?

Thanks!