Dmitry, I confirm your solution. I already uninstalled ureadahead (no need for it with a SSD).
I added killall dhclient to my /etc/init.d/umountfs (at the beginning of the do_stop function).
This problem happens for me only when I use the regular wired ethernet on my ThinkPad X230 (not just when the laptop is docked to the UltraBase as I've reported earlier) . It doesn't happen when I'm using wireless.
Dmitry, I confirm your solution. I already uninstalled ureadahead (no need for it with a SSD).
I added killall dhclient to my /etc/init. d/umountfs (at the beginning of the do_stop function).
This problem happens for me only when I use the regular wired ethernet on my ThinkPad X230 (not just when the laptop is docked to the UltraBase as I've reported earlier) . It doesn't happen when I'm using wireless.