I was trying to install ubuntu-desktop package in Ubuntu-Gnome(gnome shell). Using unity-tweak I set theme as Ambiance. But only gtk2 applications are looking good. All gtk3 application has ugly border(header bar) and background(sometimes). I have attached a screenshot.
What is the default gtk3-theme-engine in Ubuntu unity?
if I run gtk3 application with root permission then theme is okay. I also created a new user but result is same.
I don't think the gtk3-theme-engine is the one you are looking for. Anyway this is on fresh installed Ubuntu 14.04 machine:
$ locate theming-engines
/usr/lib/x86_64-linux-gnu/gtk-3.0/3.0.0/theming-engines
/usr/lib/x86_64-linux-gnu/gtk-3.0/3.0.0/theming-engines/libunico.so
$ dpkg -S /usr/lib/x86_64-linux-gnu/gtk-3.0/3.0.0/theming-engines/libunico.so
gtk3-engines-unico:amd64: /usr/lib/x86_64-linux-gnu/gtk-3.0/3.0.0/theming-engines/libunico.so
$ apt-cache rdepends gtk3-engines-unico
gtk3-engines-unico
Reverse Depends:
light-themes
libgtk-3-0
References:
It seems to me, a configuration problem.
Check the environment variables by runing env look for GTK_THEME, GTK_RC_FILES, GTK_CSD.
env | grep -i gtk
Look if you have gtkrc in your home folder
sudo find ~/ -iname gtkrc
GTK_THEME force Gtk3 application to use custom themes folder.
GTK_RC_FILES can change some Gtk3 theme settings/properties.
GTK_CSD tells Gtk3 to use Wayland Client Side Decoration, and default for Gtk3 application is to use the new header bar.
Well it was found by shantanu (OP):
WOW, I found the culprit.
export GTK_CSD=1was in/etc/profile. And this variable was forcing gtk3 application to use CSD header.
My best guess is that the version of the Ambiance theme that is available is not fully compatible with the version of GTK+ that we ship.
It would probably be a lot easier for you and provide a better experience to use Ubuntu vanilla than to try to install Unity in elementary OS.
I have got a partial solution. Using gtk3-nocsd, we can disable client side decoration. For Unity, we have to use this for an application separately. You cannot set it in environment. (i.e To fix gnome-terminal, edit /usr/share/applications/gnome-terminal.desktop and modify Exec= line as following)
EXEC=env LD_PRELOAD=/usr/lib/gtk3-nocsd/gtk3-nocsd.so gnome-terminal
sudo add-apt-repository ppa:nilarimogard/webupd8
sudo apt-get update
sudo apt-get install gtk3-nocsd
If you want to use GTK, first change your display manager. Perform following operations.
sudo apt-get install gdm
sudo dpkg-reconfigure lightdm
You will get a screen like this...
choose "gdm" using your cursor and then press enter.
Then you can restart the machine (optional), or just log out and login to "gnome-shell"
Therafter you can use "tweak-tool"
sudo apt-get install gnome-tweak-tool
Open the tweak-tool. Here you can choose whatever theme you may like, but make sure "Window" & "GTK+" has the same theme, else you will get the issue as you mentioned, that the window headers will be different.
I personally like Vertex theme. Try it out.. its quite brilliant,especially the dark one.
