kwin is missing / removed after upgrade from kubuntu 14.10 to 15.04

fenris@macbuntu:~$ apt-cache policy kwin
kwin:
  Installed: (none)
  Candidate: 4:5.2.1-0ubuntu1
  Version table:
     4:5.2.1-0ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ vivid/universe i386 Packages
     4:5.1.1-0ubuntu1~ubuntu14.10~ppa1 0
        100 /var/lib/dpkg/status
fenris@macbuntu:~$ sudo apt-get install kwin
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following package was automatically installed and is no longer required:
  libindicate-qt1
Use 'apt-get autoremove' to remove it.
The following extra packages will be installed:
  libkwin4-effect-builtins1 libkwineffects6 libkwinglutils6 libkwinxrenderutils6 libxcb-xtest0
Suggested packages:
  kwin-addons
Recommended packages:
  kwin-decoration-oxygen
The following NEW packages will be installed:
  kwin libkwin4-effect-builtins1 libkwineffects6 libkwinglutils6 libkwinxrenderutils6 libxcb-xtest0
0 upgraded, 6 newly installed, 0 to remove and 0 not upgraded.
Need to get 1,894 kB/1,982 kB of archives.
After this operation, 9,686 kB of additional disk space will be used.
Do you want to continue? [Y/n]

After installed the kwin, i can peacefully login to KDE Plasma 5.2