I tried installing TLP in ubuntu 18.04 using the command line
sudo add-apt-repository ppa:linrunner/tlp
But I get the following error:
How do I solve this problem?
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You are reading old instructions off the internet.
tlp is included in Ubuntu's universe repository so all you need to type is:
sudo apt install tlp
If you want to utilize the Radio Wizard also use:
sudo apt install tlp-rdw
Thinkpad users can install optional packages for battery threshold levels:
sudo apt-get install tp-smapi-dkms acpi-call-dkms
Source: Welcome to TLP!