Automatic upgrade from 2.6.0.beta5 to 2.7.0.beta3 failed

[Falco]

@glynhudson

The error seems to be

createdb: error: database creation failed: ERROR: database "discourse" already exists

No that is not the reason.

The problem is

@glynhudson

undler::GemNotFound: Your bundle is locked to msgpack (1.4.1), but that version could not be found in any of the sources listed in your Gemfile. If you haven't changed sources, that means the author of msgpack (1.4.1) has removed it. You'll need to update your bundle to a version other than msgpack (1.4.1) that hasn't been removed in order to install.

The author of msgpack yanked it, so @tgxworld fixed this problem via

DEV: Update msgpack to 1.4.2.