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Re: [Question #703312]: cannot attach cgroup program: Operation not permitted

 

Question #703312 on Ubuntu changed:
https://answers.launchpad.net/ubuntu/+question/703312

Manfred Hampl requested more information:
What is the output of the command

sudo update-grub

For the messages
The following signatures were invalid
try the command (even if it may report being deprecated)

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys
1F3045A5DF7587C3 18DF3741CDFFDE29

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