The Tip Show How-to Add the Darktable PPA Apt Repo for Linux Mint/Ubuntu GNU Desktops.
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Open a Command Line Console Session
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Enabling the Darktable Apt PPA
sudo su -c "apt-add-repository ppa:pmjdebruijn/darktable-release"
If Got “User is Not in Sudoers file” then Look: Solution
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Refresh Apt Repositories
sudo apt-get update