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Re:Meltdown and Spectre Linux kernel status by dorfsmay on Saturday January 06, 2018 @11:48AM (#16086030)
They will be available on 2018/01/09:

"Ubuntu users of the 64-bit x86 architecture (aka, amd64) can expect updated kernels by the original January 9, 2018 coordinated release date, and sooner if possible."

https://insights.ubuntu.com/2018/01/04/ubuntu-updates-for-th...

Re:Meltdown and Spectre Linux kernel status by tyrust on Saturday January 06, 2018 @03:01PM (#16087123)
The status of patches can be viewed at the CVE pages listed at https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SpectreAn...