Mattermost Omnibus 9.3 upgrade to 10.x

Hello,

I need to upgrade from Mattermost Omnibus 9.3.0 to 10.4.2 on an Ubuntu 20.04 (Focal) machine. The apt package manager indicates that 10.4.2 is the latest package available.

Will the Omnibus package upgrade gracefully to 10.x from 9.3 via apt or do I need to find/install the specific ESR verions of the Omnibus package (9.5.x, 9.11.x) and install those in order?

Yes, ESR to ESR is the trongly recommended path. Version archive - Mattermost documentation

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