On Wed, Jun 02, 2021 at 07:06:59PM +0000, Simon Peyton Jones via ghc-devs wrote:
> Dear devs
> I wanted to install GHC 8.10 on my WSL2 (Windows Subsystem for Linux)
> computer.
[...]
> 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)
Turns out it was actually WSL1 and upgrading to WSL2 resolved the
problem.
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