While installing ubuntu 16.04
I am getting:
Failed to create sharedmemoryfile /WK2SharedMemory.34567654: Permission denied
from the ubuntu installer at the stage of restoring previously installed packages.
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As I wrote before in a comment: this happens when you reinstall without formatting the root partition (or partitions where the packages are stored e.g. /usr if you do such a thing). Ubiquity Installer tries to restore the previously installed packages and during that stage Webkit seems to act up. If you open a terminal and run
top you will find a
WebKitWebProcess consuming 100% CPU, kill it with
killall WebKitWebProcess and the installation will continue. You may not be able to spawn a terminal when it already happened, instead switch to a virtual terminal with Ctrl+Alt+F1 login as user
ubuntu with an empty password and kill the process there, be patient, it might take some time to perform this, then switch back to the GUI Ctrl+Alt+F7 and wait for the installation to continue and complete.
I filed a bug on Launchpad for this after some testing: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1607779
If all of this doesn't work for you and you can't get Ubuntu installed without formatting the partition, then make a list of installed packages (dpkg -l with minimal scripting and review of the output can do this for you) and compare modifications you made to /etc and other directories. This is another reason to make backups: compare what previously had after a fresh install.