I just ran the Software Updater (on Ubuntu 16.04).
While installing the new packages (including a new kernel version) I got a Grub Secure Boot alert.
After that the Software Updater crashed.
It stuck at post-installation-triggers on shim-signed.
After having killed all processes related to dpkg I tried to configure it again
sudo dpkg --configure -a
which returned the following:
Setting up shim-signed (1.32~16.04.1+0.9+1474479173.6c180c6-1ubuntu1) ... debconf: DbDriver "config": /var/cache/debconf/config.dat is locked by another process: Resource temporarily unavailable dpkg: error processing package shim-signed (--configure): subprocess installed post-installation script returned error exit status 1 Errors were encountered while processing: shim-signed
I fear that if I restart I'll have problems with booting. Can I reconfigure shim-signed, or can I revert the update somehow?