Fixes #9555: sudo not needed with cert authn

Signed-off-by: Neal McBurnett <neal@mcburnett.org>
Update Ubuntu install instructions regarding dated Ubuntu docker.io

Docker-DCO-1.1-Signed-off-by: Phil Estes <estesp@linux.vnet.ibm.com> (github: estesp)
Merge pull request #9556 from nealmcb/9555-https-no-sudo

Fixes #9555: sudo not needed with cert authn
Merge pull request #9633 from estesp/docs-ubuntu-install

DOCS: Update Ubuntu install instructions regarding dated Ubuntu docker.io