From the look of it, it is a badly generated ~/.config/wslu/exec/baseexec. Right now we have a fix to solve this problem, but only available for Ubuntu 20.04 LTS for now. It will be available to bionic (and also xenial) very soon.
For now, you can edit thi file manually to `/mnt/c/Users/<Your Windows User Folder>/AppData/Local/Microsoft/WindowsApps/CanonicalGroupLimited.Ubuntu18.04onWindows_79rhkp1fndgsc/ubuntu1804.exe` for "Ubuntu 18.04 LTS" or `/mnt/c/Users/<Your Windows User Folder>/AppData/Local/Microsoft/WindowsApps/CanonicalGroupLimited.UbuntuonWindows_79rhkp1fndgsc/ubuntu.exe` for "Ubuntu".
Also thanks to you, I discovered another bug affecting the latest fix.
Thank you for the report.
From the look of it, it is a badly generated ~/.config/ wslu/exec/ baseexec. Right now we have a fix to solve this problem, but only available for Ubuntu 20.04 LTS for now. It will be available to bionic (and also xenial) very soon.
For now, you can edit thi file manually to `/mnt/c/Users/<Your Windows User Folder> /AppData/ Local/Microsoft /WindowsApps/ CanonicalGroupL imited. Ubuntu18. 04onWindows_ 79rhkp1fndgsc/ ubuntu1804. exe` for "Ubuntu 18.04 LTS" or `/mnt/c/Users/<Your Windows User Folder> /AppData/ Local/Microsoft /WindowsApps/ CanonicalGroupL imited. UbuntuonWindows _79rhkp1fndgsc/ ubuntu. exe` for "Ubuntu".
Also thanks to you, I discovered another bug affecting the latest fix.