Can't install nodejs-legacy in 14.04 image about docker-brew-ubuntu-core

[tianon]

This looks like it's due to an out-of-date Apt cache, probably sitting in a Docker cache from a previous line. You should make a habit of using RUN lines like RUN apt-get update && apt-get install -y package package to make sure that the Apt cache is always refreshed when and where it needs to be.

[aknuds1]

Yeah, I've started prefixing my RUN apt-get's with apt-get update, but in this case APT was updated only minutes prior to the failing installation (before getting cached by Docker). Isn't that a bit strange?

[tianon]

A little bit, but not really all that unusual. The default mirror is http://archive.ubuntu.com, which is actually a round-robin of a bunch of mirrors, so you might have just happened to hit two mirrors that were slightly out of sync by an odd chance of luck, too.

[aknuds1]

OK, thanks!

[tianon]

So just to confirm, if you try the build again, does it succeed?

[aknuds1]

Well, the error was always intermittent anyway. But hopefully it's solved after switching to your recommended approach.

[tianon]

Ah, I see. I do get intermittent Apt errors myself, but they are usually due to managing to get two different mirrors crossed via the round-robin, which I think is the issue here, so I think we're OK to close this. Do you agree?

[aknuds1]

Go ahead.

[tianon]

Cool, thanks. :)