So, I've just spent an hour or two trying to make a new heroku app on my ubuntu machine, and I was getting nowhere.
$git push heroku master
Agent admitted failure to sign using the key.
Permission denied (publickey).
fatal: The remote end hung up unexpectedly
I'd followed all the usual help on stackoverflow and heroku's excellent help section but was making no progress. Until I discovered
this.
The link to the bug report didn't work for me, but it's clear that I needed to set this SSH_AUTH_SOCK=0 environment variable first:
$export SSH_AUTH_SOCK=0
$git push heroku master
And now we're off!
