For Budgie Users (and GNOME too, probably?)
Download from my GitHub here: https://raw.githubusercontent.com/tomocafe/dotfiles/master/solus/bin/gblurlock
Make it executable (chmod 755 gblurlock) and execute it from the command line.
If you wish, you can move it to a directory that is in your $PATH. You could also make it part of your session init routine so that your lock screen is always consistent with your desktop background.
It uses gsettings and convert to get the path to your current background image path, make a blurred version, and apply it to gnome-screensaver (the lock screen). It will save the blurred version of your desktop background to ~/.gblurlock (or set $WALLDIR to change this).
Note: this might already exist, but it was simple enough to make. Enjoy!
