Ubuntu 15.04 : Sound, keyboard, terminal shortcut stopped working

I have recently upgraded to Ubuntu 15.04. After this, I am facing some weird errors.

1. My shortcut Ctrl+Alt+T stopped working for terminal.
2. Function keys for sound not working anymore.
3. My keyboard settings are not working, not able to switch or use any other language except English.
4. Unity tweak tool throwing error on startup:

     Following Schema is missing:
       org.gnome.settings-daemon.peripherals.touchpad

What am I doing wrong and how should I remedy this?

Try to turn off or on shortCuts(Commands) in CompizConfig Setting Manager (Icon with keyboards keys y+z+Ctrl). This solved my problems with shortcuts in Unity Ubuntu 15.04.

After so much efforts I was able to solve my problem myself. I did the following steps and it worked.

1. Uninstall gnome-settings-daemonsudo apt-get remove gnome-settings-daemon
2. uninstall all other packages, which are not required sudo apt-get autoremove
3. After uninstalling, I tried to install gnome-settings-daemon again using sudo apt-get install gnome-settings-daemon but it started showing me some broken dependencies issues related to gnome-settings-daemon-schemas.
4. So, I opened Synaptic Package manager and reinstalled gnome-settings-daemon-schemas.
5. After it, I installed gnome-Settings-Daemon from Synaptic package manager and it was successfully installed without any dependency issue.

restarted the system and Everything started working except Unity Tweak tool which was now giving me new error that com.canonical.unity.webapps is missing. So, I installed sudo apt-get install unity-webapps-serviceand it worked.

Now, the only problem I am facing is Indicators are missing. like TextEntry change indicator on taskbar, screen brightness change, sound change indicators etc. But everything is working now.

Thanks, I hope my answer will help