I'm guessing you added the group as a non-system group?
(resulting in "addgroup: The group `docker' already exists and is not a system
I think it would probably be sane to add a check similar to the one
Docker itself uses (namely whether "/etc/group" includes a line that
starts with "docker:" -- ie, not using "getent group" since Docker
parses the file directly).
| if ! grep -q '^docker:' /etc/group 2>/dev/null; then
| addgroup --system docker
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Already created docker group prevents package docker.io
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