When i log out and then log in again, the applications shown in Unity launcher are the default applications, neither can i add an application nor can i hide a default application. How to make Unity remember my apps?
You may have a bug. I simply right click on the items in the launcher to pin or unpin them.
For those who're looking for a solution to make Unity remember settings after a GNOME3 update and reverting back to Unity, I have a solution which uses the above Q&A as a start.
If you've installed
libdconf0, you can run into a problem which is:
when you try editing Unity's Launcher settings with
sudo dconf-editor, you can find the right values under desktop > unity > launcher, but it seems to be read-only;
when you try to use use gsettings, it says
GLib-GIO-Message: Using the 'memory' GSettings backend. Your settings will not be saved or shared with other applications.
then don't give up, you're only one step away from solving the problem!
This solution is quite fun; you will have to re-add the gnome3 team repo and install a package from there:
sudo add-apt-repository ppa:gnome3-team/gnome3 sudo apt-get update sudo apt-get install dconf-gsettings-backend
[I don't really know why this works, but it seems installing GNOME3 stuff messes up the GSettings backends so much that it can't be repaired by only installing dconf-tools and libdconf0.]
You can check whether the settings are writeable by running
gsettings writable com.canonical.Unity.Launcher favorites
If everything is fine then it returns true and after a logout/login Unity will remember the settings.