[Bug 1702335] Re: package grub-efi-amd64-signed (not installed) failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

whenever i installed something it work but gave me an error message about grub.Today i installed an app from software center and it crashed. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1702335 Title

[Bug 1704732] [NEW] package shim-signed 1.28~16.04.1+0.9+1474479173.6c180c6-1ubuntu1 failed to install/upgrade: subprocess installed post-installation script returned error exit status 1

Public bug reported: i tried to update gedit. i googled it,i found this:https://askubuntu.com/questions/616700/how-to-get-new-face-of-gedit, i followed this: sudo apt-add-repository ppa:gnome3-team/gnome3 sudo apt-get update sudo apt-get remove gedit && sudo apt-get install gedit and then crash