Pick is a free and open source colour picker for Linux. Using this your can pick colour from your screen and it remembers the selected colour, gives a names for that colour and shows as a list of screenshot. Using this screenshot it will help you to find and remember where you got the colour from. It is a easy to use tool. Start the Pick and click the picker button and pick the colour from your screen. It is released under MIT License.
Install Pick Colour Picker on Ubuntu:
You can install Pick Colour Picker via the snappy package on Ubuntu. Open your terminal app (ctrl+alt+t) and type the below Pick Colour Picker snap installation command and press the enter key.
sudo snap install pick-colour-picker
Type your Ubuntu password to confirm the Pick Colour Picker installation. It will install Pick Colour Picker on your Ubuntu. To start Pick Colour Picker run this command in terminal.
You can also start Pick Colour Picker by clicking the show applications button in your Ubuntu Gnome dock and type Pick in the search box and click Pick.