[isabelle-dev] System migration

[Lars Hupel]

Dear Isabelle developers and users,

we will perform a large-scala system migration over the next 24–48
hours. The purpose is to move towards the latest Ubuntu 18.04 LTS.

Affected will be continuous integration, the AFP, and the AFP submission
service.

Expect intermittent unavailability and HTTPS errors.

I will update as soon as the migration is completed.

Cheers
Lars