While doing a software update (currently using 16.04), everything in the window went grey during install, and is apparently stuck on "configuring shim-signed". I am not wanting to cancel installation...is this just a matter of patience? How long should I wait? What should I do?
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I had to end the Software Updater and reboot, then use terminal to do sudo apt-get update
Then, I also followed the instructions to run dpkg --configure -a
After that, I did sudo apt-get update
again, followed by sudo apt-get upgrade
This worked for me, but I'm not saying definitively that this will fix your issue as well.