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You can install Krita in a number of ways. The simplest process is to use the Ubuntu Software Center.
Open Ubuntu Software Center and do a search on Krita:
Click on Krita and follow the prompts to install the Krita.
To install Krita via PPA open terminal via menu or via keys CLT+ALT+T.
sudo add-apt-repository ppa:kritalime/ppa
This will enable the PPA for Krita in your system.
Next you have to update the system before install. With the command below you will update the repositories.
sudo apt update
After update you can install Krita via the command below:
sudo apt install krita
Once installed you can start the application from your Desktop Menu.