I can't follow the …/admin/upgrade instruction

Yesterday I was updated Docker, but not Discourse. Today I visit …/admin/upgrade, the page show like this:


I tried to follow the instruction, but it dosen’t work.

cd /var/discourse
git pull
./launcher rebuild app

It displayed: Cannot connect to the docker daemon - verify it is running and you have access

You probably need to run the launcher with sudo.

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