This happened on a second Ubuntu machine (this second one is running in VirtualBox on an OSX machine).
I have an strace log to contribute, it it's helpful. The strace command line was:
strace -f -F -tt -x -e trace=all -e signal=all -e read=all -e write=all -o ~/Desktop/update-manager-strace.txt -p 1848
The point where I click "Install Updates" button happens at 08:43:10.464345
This happened on a second Ubuntu machine (this second one is running in VirtualBox on an OSX machine).
I have an strace log to contribute, it it's helpful. The strace command line was:
strace -f -F -tt -x -e trace=all -e signal=all -e read=all -e write=all -o ~/Desktop/ update- manager- strace. txt -p 1848
The point where I click "Install Updates" button happens at 08:43:10.464345