I get a similar error message on Ubuntu Wily.
It looks like libkdecorations4abi2 was part of kde-workspace, but this
package has been removed from Ubuntu 15.04 and later releases, and been
replaced with plasma-workspace[1].
[1] See the removal request for Vivid at
** Changed in: kde-style-qtcurve (Ubuntu)
Importance: Undecided = Medium
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https://bugs.launchpad.net/bugs/1452218
Title:
qtcurve cannot be installed due to dependency
To manage
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: kde-style-qtcurve (Ubuntu)
Status: New = Confirmed
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https://bugs.launchpad.net/bugs/1452218
