Beta release is failed on Python 3.7 bot for Linux

[asvetlov]

Travis job is here: https://travis-ci.com/aio-libs/aiohttp/jobs/166684135
Job restart doesn't help
@webknjaz do you have any idea?

[aio-libs-bot]

GitMate.io thinks the contributor most likely able to help you is @webknjaz.

Possibly related issues are #467 (Failed building wheel for aiohttp on Python 3.5.0rc1), #537 (Drop python 3.3 support), #2704 (Errors installing on 3.7 beta), #2674 (Auto patch ssl for Python 3.7-), and #1603 (1.3 Release).

[yjqiang]

travis-ci/travis-ci#9815 (comment)
Looks like the same reason?

[asvetlov]

But we have dist: xenial and sudo: required in travis config already: https://github.com/aio-libs/aiohttp/blob/master/.travis.yml#L6-L7

[webknjaz]

Hi, I'll check this today in the evening 🌃. Flying ✈ currently.

[webknjaz]

What @yjqiang is very close to our problem: Travis CI tries to grab Python 3.7 archive for Ubuntu 14.04 while it should be downloading one for Xenial. So something may be wrong with overriding global settings on the job level.
It doesn't seem to be related to @asvetlov's changes to .travis.yml either.

[webknjaz]

Should be fixed by 4bad3dc. @yjqiang's guess was correct after all.

[asvetlov]

Thanks, @webknjaz !

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