You can use
click command to easily list, manage and destroy click packages and chroot builds.
The chroots can take up disk space of over 2GB. So knowing how to properly remove them when not being used is a must.
To list all installed Click packages
sudo click list
list command may not work sometimes. So, also check in ‘/var/lib/schroot’ directory to find out the chroots done by the Ubuntu SDK. To summarize disk space occupied, use ..
sudo du -h --max-depth= 1 /var/lib/schroot
To destroy a chroot use the command,
sudo click chroot –architecture ARCH -f FRAMEWORK
sudo click chroot --architecture armhf -f ubuntu-sdk-14.10 destroy
Unistalling the Ubuntu SDK
To completly purge the SDK, including Qt Creator and its plugins
sudo apt-get purge ubuntu-sdk*
Alternatively you can revert all the changes made by ubuntu-sdk-team/ppa
sudo add-apt-repository ppa:ubuntu-sdk-team/ppa
sudo apt update && sudo ppa-purge ppa:ubuntu-sdk-team/ppa