I'm having this problem too. By running 'ps aux | grep modprobe' I can see the process that is hanging update-initramfs. If I kill them then the process finishes:
modprobe --set-version=2.6.35-22-generic --ignore-install --quiet --show-depends usbhid
modprobe --set-version=2.6.35-22-generic --ignore-install --quiet --show-depends hid_logitech
modprobe --set-version=2.6.35-22-generic --ignore-install --quiet --show-depends hid_pl
modprobe --set-version=2.6.35-22-generic --ignore-install --quiet --show-depends hid_tmff
modprobe --set-version=2.6.35-22-generic --ignore-install --quiet --show-depends hid_zpff
I'm having this problem too. By running 'ps aux | grep modprobe' I can see the process that is hanging update-initramfs. If I kill them then the process finishes: 2.6.35- 22-generic --ignore-install --quiet --show-depends usbhid 2.6.35- 22-generic --ignore-install --quiet --show-depends hid_logitech 2.6.35- 22-generic --ignore-install --quiet --show-depends hid_pl 2.6.35- 22-generic --ignore-install --quiet --show-depends hid_tmff 2.6.35- 22-generic --ignore-install --quiet --show-depends hid_zpff
modprobe --set-version=
modprobe --set-version=
modprobe --set-version=
modprobe --set-version=
modprobe --set-version=