7.8.1 cabal install of vector package (dependent on primitive package) fails

Hi, Ubuntu 12.04, 64 bit x86, ghc 7.8.1 gives the following: # cabal install --global vector ... [ 5 of 19] Compiling Data.Vector.Fusion.Stream.Monadic ( Data/Vector/Fusion/Stream/Monadic.hs, dist/build/Data/Vector/Fusion/Stream/Monadic.o ) Loading package ghc-prim ... linking ... done. Loading package integer-gmp ... linking ... done. Loading package base ... linking ... done. Loading package primitive-0.5.2.1 ... <command line>: can't load .so/.DLL for: libHSprimitive-0.5.2.1.so (libHSprimitive-0.5.2.1.so: cannot open shared object file: No such file or directory) cabal: Error: some packages failed to install: vector-0.10.9.1 failed during the building phase. The exception was: ExitFailure 1 Cheers, Vivian