On Mon, Sep 14, 2009 at 05:35:39PM +0200, JM wrote: > $modprobe -v isofs > insmod /lib/modules/2.6.30-ARCH/kernel/lib/zlib_inflate/zlib_inflate.ko > WARNING: Error inserting zlib_inflate > (/lib/modules/2.6.30-ARCH/kernel/lib/zlib_inflate/zlib_inflate.ko): > Invalid module format And which package owns /lib/modules/2.6.30-ARCH/kernel/lib/zlib_inflate/zlib_inflate.ko? $ zgrep -i ZLIB_INFLATE /proc/config.gz CONFIG_ZLIB_INFLATE=y shows that ZLIB_INFLATE is not a module. Did you left something from a previous (custom) kernel build? A full depmod should be able to fix the problem.