WSL Toolchain does not support Ubuntu 18.04
Answered
WSL Ubuntu 18.04 is installed, configured with [ubuntu_setup_env.sh](https://github.com/JetBrains/clion-wsl/blob/master/ubuntu_setup_env.sh)

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Hi! Have you checked up the ssh connection? Could you please try to specify the path to WSL toolchain manually?
I've not tried it with 18.04 yet, but I had both 16.04 and 18.04 installed simultaneously and got the exact same error you did. I could manually ssh, but CLion would never connect.
I ended up uninstalling 18.04, and it worked fine again. I'll next try having just 18.04 installed and see if that works.
Thanks for the response! Feel free to comment or upvote the related issue in our tracker: https://youtrack.jetbrains.com/issue/CPP-12968. Please follow it to get updates.
@Fullyarticulate
The fix for the issue will be available in next CLion EAP.