chromium-browser not being found by Applications menu, despite being in /usr/share/applications

[Reuben Firmin]

I have the following browsers installed in kubuntu:
a) google-chrome
b) chromium-browser
c) firefox

#a and #c are found by the applications launcher when I type in their names. #b is not. All three have .desktop entries in /usr/share/applications.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: kubuntu-desktop 1.338
ProcVersionSignature: Ubuntu 4.4.0-24.43-generic 4.4.10
Uname: Linux 4.4.0-24-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: KDE
Date: Wed Jul 13 13:17:05 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2016-04-29 (74 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/usr/bin/fish
SourcePackage: kubuntu-meta
UpgradeStatus: No upgrade log present (probably fresh install)