Hello, # apt-get install libghc-bzlib-dev # cd cabal-debian # cabal install works only with this command: ~/.cabal/bin/cabal-debian --official --upgrade Indeed, the PATH should in another order to have priority on cabal version installed (/usr/bin/cabal-debian ; maybe there are other conflicts I do not know yet): export PATH="${HOME}/.cabal/bin:${PATH}" (in order to get the version installed with cabal) Cheers, -- Alexandre Delanoë (anoe)