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Ubuntu 23.04 & 22.04.3 Installs Haven't Been Following Their Own Security Best Practices
It turns out that Ubuntu Linux installations of Ubuntu 23.04, 22.04.3 LTS, and installs done since April 2023 that accepted the Snap version update haven't been following Ubuntu's own recommended security best practices for their security pocket configuration for packages. A new Subiquity release was issued today to fix this problem while those on affected Ubuntu installs are recommended to manually edit their /etc/apt/sources.list file.
Subiquity 23.09.1 was released today and explains:
"This release addresses an issue (LP: #2033977) where the security pocket in sources.list can end up not configured matching documented best practices. It is recommended to configure the $series-updates to come from security.ubuntu.com, to minimize the effect of mirroring delays.
Affected systems will be ones installed with Ubuntu 23.04, 22.04.3LTS, or installs done since April 2023 that accepted the snap version update.
To correct systems already installed, please modify /etc/apt/sources.list, look for the lines containing -security, and update them to use https://security.ubuntu.com."