\\wsl$\running dist not working Problem accessing your WSL - Windows Subsystem for Linux - linux files in Windows 10 1903. Probably a missing P9NP in Order in registry.
If you cant access \\wsl$\Ubuntu it is probably because the updater missed to activate the P9NP component.
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\NetworkProvider\Order]
is missing P9NP.
reg query HKLM\SYSTEM\CurrentControlSet\Control\NetworkProvider /s
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\NetworkProvider\HwOrder]
"PROVIDERORDER"="RDPNP,LanmanWorkstation,webclient"
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\NetworkProvider\Order]
"PROVIDERORDER"="RDPNP,LanmanWorkstation,webclient"
Easy fix is to insert P9NP first in the list as in this WSL issue
reg export HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\NetworkProvider NetworkProvider.reg
edit the .reg file to have P9NP first the the list of Order and HwOrder
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\NetworkProvider]
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\NetworkProvider\HwOrder]
"PROVIDERORDER"="P9NP,RDPNP,LanmanWorkstation,webclient"
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\NetworkProvider\Order]
"PROVIDERORDER"="P9NP,RDPNP,LanmanWorkstation,webclient"
then import it (with local admin right)
runas /noprofile /user:domain\localadmin "reg import NetworkProvider.reg"