An upadte of kde is actually proposed by the ubuntu server. The 4.11.3 version proposed is a regession compared to 4.11.2
See:
https://bugs.kde.org/show_bug.cgi?id=327224
Dolphin can no longuer be used as a ftp client.
Corrected in 4.11.4
:huh:
[color=#000080]From a terminal must first add the following repository:[/color]
[size=medium]sudo add-apt-repository ppa:kubuntu-ppa/backports[/size]
[color=#000080]And then upgrade with:[/color]
[size=medium]sudo apt-get update && sudo apt-get upgrade[/size]
[color=#000080]If there held packages, you can run:[/color]
[size=medium]sudo apt-get dist-upgrade[/size]
[color=#000080]Must see, though, what packages are being held and why. Sometimes kernel updates are retained and if we need a particular version may not want you to force your update. Once the procedure is complete enough to close and sign new account to use KDE SC 4.12 in all its glory.[/color] 