libkf5guiaddons5: KDE is stuck in login splash screen

["hannu.tmp@pp.inet.fi" <hannu.tmp@pp.inet.fi>]

>iOn Wednesday 19 August 2015 15:05:12 Peter Marschall wrote:
>> Downgrading those packages to stable is not possible, asd these packages
>> were introduced after the last release only.
>
>You could downgrade those packages to a previous version by using 
>snapshot.debian.org

Or previous versions of those packages might be in /var/cache/apt/archives

cd /var/cache/apt/archives

and then

dpkg -i  write_the_package_name_here.deb   and_all_other_packages_that_have_dependencies.deb    and_so_on.deb