Friends I'm trying to update my installation of alex, on Unix (Ubuntu). But I get the dump below It's complaining about a lock file being an invalid argument (see highlight below). If I manually remove the file I get past that, it successfully installs tf-random, but the same thing happens on the next package. So I can install packages one at a time, but that's silly. Any ideas? Simon cabal install alex Resolving dependencies... Configuring tf-random-0.5... Building tf-random-0.5... Failed to install tf-random-0.5 Build log ( /home/simonpj/.cabal/logs/tf-random-0.5.log ): cabal: Entering directory '/tcabal mp/cabal-tmp-26141/tf-random-0.5' Configuring tf-random-0.5... Building tf-random-0.5... Preprocessing library tf-random-0.5... [1 of 4] Compiling System.Random.TF.Gen ( src/System/Random/TF/Gen.hs, dist/build/System/Random/TF/Gen.o ) [2 of 4] Compiling System.Random.TF.Init ( src/System/Random/TF/Init.hs, dist/build/System/Random/TF/Init.o ) src/System/Random/TF/Init.hs:94:5: warning: [-Wdeprecations] In the use of 'bitSize' (imported from Data.Bits): Deprecated: "Use 'bitSizeMaybe' or 'finiteBitSize' instead" | 94 | | bitSize n > 64 = error "mkTFGen: case where size of Int > 64 not implemented" | ^^^^^^^ [3 of 4] Compiling System.Random.TF ( src/System/Random/TF.hs, dist/build/System/Random/TF.o ) [4 of 4] Compiling System.Random.TF.Instances ( src/System/Random/TF/Instances.hs, dist/build/System/Random/TF/Instances.o ) Creating package registration file: /tmp/pkgConf-tf-random-05965166491189641421.5 Installing library in /home/simonpj/.cabal/lib/x86_64-linux-ghc-8.2.1/tf-random-0.5-ABDhxe3mXYlHUEE5hzgewx Registering tf-random-0.5... cabal: '/usr/local/bin/ghc-pkg' exited with an error: ghc-pkg: Couldn't open database /home/simonpj/.ghc/x86_64-linux-8.2.1/package.conf.d for modification: {handle: /home/simonpj/.ghc/x86_64-linux-8.2.1/package.conf.d/package.cache.lock}: hLock: invalid argument (Bad file descriptor) cabal: Leaving directory '/tmp/cabal-tmp-26141/tf-random-0.5' cabal: Error: some packages failed to install: QuickCheck-2.10.0.1 depends on tf-random-0.5 which failed to install. alex-3.2.1 depends on tf-random-0.5 which failed to install. tf-random-0.5 failed during the final install step. The exception was: ExitFailure 1 simonpj@cam-05-unx:~/code/HEAD$