linux-backports-modules-2.6.31-21-generic 2.6.31-21.23 (i386 binary) in ubuntu karmic

 This package contains modules supplied by Ubuntu for Linux kernel 2.6.31 on
 x86/x86_64.
 .
 You likely do not want to install this package directly. Instead, install
 the linux-backports-modules-generic meta-package, which will ensure that upgrades work
 correctly, and that supporting packages are also installed.