The windows Linux subsystem does not run full Linux only the command line, making the subsystem useless as a full Linux installation, I should know, I've tried it and there is no way of actually installing a full graphical version of Ubuntu using the windows Linux subsystem.
WUBI should never have been stopped, it's the best installer for windows to install Ubuntu without the need to destroy the MBR, meaning if Ubuntu is installed in it's own dedicated partition, and something goes wrong, there's no way to return the MBR back to before Ubuntu was installed, at least with WUBI, if something goes wrong, then all one has to do, is boot into Windows and uninstall Ubuntu,,, simple!, can that be said about installing Ubuntu in its own dedicated partition? NO!, because if something went wrong with the booting of Ubuntu and one can only reboot into Windows,,, Windows can not read a Linux partition, so restoring the partition and MBR can not be done through Windows.
The only way to restore the MBR, is to use a utility that saves a backup of the MBR on a bootable pen drive along with the MBR utility,,,, then when something goes wrong with either the installation or booting of Ubuntu, then just boot from the pen drive, run the MBR utility, load the previously saved MBR back, and reboot, simple!, Windows is back to as if Ubuntu had never been installed.
That's why WUBI should never have been stopped.