This is addressed here: http://askubuntu.com/questions/70599/how-to-
change-tooltip-background-color-in-unity
In short, a workaround (until this is fixed) involves:
1. install unity-tweak-tool: sudo apt-get install unity-tweak-tool
2. run the tool, and modify the theme to something else ("Highcontrast" and
"Adwaita" themes work for me).
Also in the askubuntu link above, it is mentioned that you can manually
tweak aspects of individual themes by making modifications to files
within /usr/share/themes. This might be more work, but allows you to
use your preferred theme.
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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to ubuntu-themes in Ubuntu.
https://bugs.launchpad.net/bugs/1332100
Title:
Colour combination makes qt tooltips unreadable in Unity
Status in “ubuntu-themes” package in Ubuntu:
Confirmed
Bug description:
I'm not sure if I'm reporting this against the right package, but I
tried to use kdevelop in the Unity environment and couldn't read its
tooltips because the text is white on a pale yellow background. I
can't find any way to change this. I tried qtconfig, but the Tune
Palette button is disabled for the default GUI Style, and has no
effect if I change the style to something else eg GTK+. However,
qtconfig does overwrite my gtk3 settings.ini with one that makes all
menus appear with black text on a dark grey background!
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: light-themes 14.04+14.04.20140410-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-29.53-generic 3.13.11.2
Uname: Linux 3.13.0-29-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
CurrentDesktop: Unity
Date: Thu Jun 19 14:59:55 2014
InstallationDate: Installed on 2014-06-13 (5 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
PackageArchitecture: all
SourcePackage: ubuntu-themes
UpgradeStatus: No upgrade log present (probably fresh install)
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https://bugs.launchpad.net/ubuntu/+source/ubuntu-themes/+bug/1332100/+subscriptions
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