I'm seeing this on Vivid plus overlay on my desktop as well as on my Nexus 4 when using citrain device-upgrade.
During package installation, the bluez install hangs. Looking at the processes, I see
28628 pts/1 S+ 0:00 sudo apt-get upgrade
28629 pts/1 S+ 29:25 apt-get upgrade
36342 pts/20 Ss+ 0:00 /usr/bin/dpkg --status-fd 66 --unpack --auto-deconfigure /var/cache/apt/archives/bluez_4.101
36348 pts/20 S+ 0:00 /bin/sh /var/lib/dpkg/info/bluez.prerm upgrade 4.101+15.04.20150914.2-0ubuntu1
36351 pts/20 S+ 0:00 /bin/sh /usr/sbin/invoke-rc.d bluetooth stop
36392 pts/20 S+ 0:00 systemctl stop bluetooth.service
36393 pts/20 S+ 0:00 /bin/systemd-tty-ask-password-agent --watch
36394 pts/20 Sl+ 0:00 /usr/bin/pkttyagent --notify-fd 5 --fallback
Can anyone suggest a fix/work-around?
Thanks,
Michi.