"Key sequence '...' is ambiguous" message box on almost every shortcut

[DimanNe]

Every time I enter "Home", "End", "Shift+Ins" Kate shows me dialog box, which says

The key sequence 'Home' is ambiguous. Use 'Configure Shortcuts'
from the 'Settings' menu to solve the ambiguity.
No action will be triggered

But when I try to fix it (and I did NOT break it, ie before updating to Kubuntu 15.04 / KDE 5 all worked well) in Configure Shortcuts, I got several problems

1) Seems that this shortcut is actually shortcut for the only action (https://img-fotki.yandex.ru/get/15581/11330794.1d/0_bc945_764f522a_orig)
and there is no any ambiguity.

2) When I try to remove "Home" from "Alternate" column and assign it to "Shortcut" column I got cryptic message

The "Home" shortcut is ambiguous with the following shortcut.
Do you want to assign an empty shortcut to this action?
Shortcut '' for action 'Move to Beginning of Line'

https://img-fotki.yandex.ru/get/6517/11330794.1d/0_bc946_3d6c33e8_orig

3) And finally, I press "Reassign" button get correct shortcuts:
https://img-fotki.yandex.ru/get/5504/11330794.1d/0_bc947_a734a49a_orig
then click "Ok"
and again try to press "Home" in Kate I again get dialog box from 1st point (The key sequence 'Home' is ambiguous. Use...)

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: kate 4:14.12.3-0ubuntu2
ProcVersionSignature: Ubuntu 3.19.0-18.18-generic 3.19.6
Uname: Linux 3.19.0-18-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.17.2-0ubuntu1.1
Architecture: amd64
CurrentDesktop: KDE
Date: Sun May 24 19:19:10 2015
InstallationDate: Installed on 2014-07-05 (323 days ago)
InstallationMedia: Kubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.1)
SourcePackage: kate
UpgradeStatus: Upgraded to vivid on 2015-02-23 (90 days ago)

[P (pggl)]

Same here. Clicking on "defaults" in the shortcut menu also does not help.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Soudan Franck (franck-soudan)]

For me, every shortcuts on kate are affected.

[pfoo (pfoo)]

This bug will trigger every time you edit KDE "Application keyboard shortcut". Shortcuts are duplicating in .config/kdeglobals, causing this to happens.
See https://bugs.kde.org/show_bug.cgi?id=343665

A temporary patch has been released, but nothing official right now.

You can hotfix your .config/kdeglobals by removing duplicates
For example, SelectAll=Ctrl+A; Ctrl+A
should become SelectAll=Ctrl+A

Another dirty fix is to simply remove all [Shortcuts] from .config/kdeglobals

[rusty_robot (rusty-robot)]

It appears they have fixed it in 5.4.1, but for those of us who are still are on Kubuntu 15.04 I've implemented pfoo's workaround as a script (deduplicate-kshortcuts.rb)

[João Pedro (jpgomes)]

Just installed Kubuntu 15.10 and this problem remains.
Thank you, rusty_robot. Your script have easily fix it for me.

[Rafael David Tinoco (rafaeldtinoco)]

I can still confirm this behavior on Ubuntu Focal.