Solve it by totally removing kde packages and qt packages. I did a purge
installation and I clean by hand the last files I have been able to found in
/etc and /usr/share reinstall everything and now it's working ok.
I hope that I have been unlucky and did an update a bad day.
** Changed in: kubuntu-meta (Ubuntu)
Status: New => Invalid
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KDE desktop stuck for seconds
https://bugs.launchpad.net/bugs/398684
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