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14.04、ログインすると

UA Infrastructure Extended Security Maintenance (ESM) is not enabled.

って言われるんだけど

$ sudo ua status
SERVICE ENTITLED STATUS DESCRIPTION
cc-eal yes n/a Common Criteria EAL2 Provisioning Packages
cis-audit no — Center for Internet Security Audit Tools
esm-infra yes enabled UA Infra: Extended Security Maintenance
fips yes n/a NIST-certified FIPS modules
fips-updates yes n/a Uncertified security updates to FIPS modules
livepatch yes n/a Canonical Livepatch service

で

$ sudo apt-get update; sudo apt-get upgrade -y

どうだ！