Dear devs I wanted to install GHC 8.10 on my WSL2 (Windows Subsystem for Linux) computer. So I went here https://www.haskell.org/ghcup/ and followed the instructions (the curl … command). There was a long pause then [ Info ] verifying digest of: ghc-8.10.4-x86_64-deb9-linux.tar.xz [ Info ] Unpacking: ghc-8.10.4-x86_64-deb9-linux.tar.xz to /tmp/ghcup-khiegA [ Info ] Installing GHC (this may take a while) [ Error ] BuildFailed failed in dir "/tmp/ghcup-khiegA": NonZeroExit 2 "make" ["install"] Check the logs at "/home/simonpj/.ghcup/logs" and the build directory "/tmp/ghcup-khiegA" for more clues. Make sure to clean up "/tmp/ghcup-khiegA" afterwards. "_eghcup --cache install ghc recommended" failed! I looked in the logs as suggested, and found this in the tail of ghc-make.log Installing library in /home/simonpj/.ghcup/ghc/8.10.4/lib/ghc-8.10.4/libiserv-8.10.4 "utils/ghc-cabal/dist-install/build/tmp/ghc-cabal-bindist" copy compiler stage2 "strip" '' '/home/simonpj/.ghcup/ghc/8.10.4' '/home/simonpj/.ghcup/ghc/8.10.4/lib/ghc-8.10.4' '/home/simonpj/.ghcup/ghc/8.10.4/share/doc/ghc-8.10.4/html/libraries' 'v p dyn' Installing library in /home/simonpj/.ghcup/ghc/8.10.4/lib/ghc-8.10.4/ghc-8.10.4 "/home/simonpj/.ghcup/ghc/8.10.4/lib/ghc-8.10.4/bin/ghc-pkg" --force --global-package-db "/home/simonpj/.ghcup/ghc/8.10.4/lib/ghc-8.10.4/package.conf.d" update rts/dist/package.conf.install ghc-pkg: Couldn't open database /home/simonpj/.ghcup/ghc/8.10.4/lib/ghc-8.10.4/package.conf.d for modification: {handle: /home/simonpj/.ghcup/ghc/8.10.4/lib/ghc-8.10.4/package.conf.d/package.cache.lock}: hLock: invalid argument (Invalid argument) ghc.mk:967: recipe for target 'install_packages' failed make[1]: *** [install_packages] Error 1 Makefile:51: recipe for target 'install' failed make: *** [install] Error 2 So I seem to be stuck. Any ideas? I feel embarrassed not to be able to install GHC 😊. Simon