Comment 1 for bug 484725

Some more info:

I've had problems with VirtualBox 3.0.12 as found on
  deb http://download.virtualbox.org/virtualbox/debian karmic non-free

Here's the VirtualBox/DKMS install log

# tail -f /var/log/vbox-install.log
Creating symlink /var/lib/dkms/vboxdrv/3.0.12/source ->
                 /usr/src/vboxdrv-3.0.12

DKMS: add Completed.

Kernel preparation unnecessary for this kernel. Skipping...

Building module:
cleaning build area....
reenter password for pam_mount:

(hangs there)

Probably related to my pam_mount config:

# grep mount /etc/pam.d/common-*
/etc/pam.d/common-auth:auth optional pam_mount.so use_first_pass
/etc/pam.d/common-auth:#auth optional /lib/security/pam_mount.so use_first_pass
/etc/pam.d/common-pammount:# # added for libpam-mount
/etc/pam.d/common-pammount:# @include common-pammount
/etc/pam.d/common-pammount:# above the common-pammount include (just as in the example above).
/etc/pam.d/common-pammount:# replace "optional" with "required" if a user must mount the specified
/etc/pam.d/common-pammount:# priority before these entries, else the pam_mount module is not
/etc/pam.d/common-pammount:# /usr/share/doc/libpam-mount/README.Debian.gz
/etc/pam.d/common-pammount:auth optional pam_mount.so use_first_pass
/etc/pam.d/common-pammount:session optional pam_mount.so
/etc/pam.d/common-session:session optional pam_mount.so
/etc/pam.d/common-session:#session optional /lib/security/pam_mount.so
/etc/pam.d/common-session-noninteractive:session optional pam_mount.so
/etc/pam.d/common-session-noninteractive:#session optional /lib/security/pam_mount.so
root@expresso2:/tmp#