The actual upgrade process from Jessie to Ascii worked with 100MB /tmp.
After rebooting on Ascii, regular updates wouldn't work with 500MB /tmp.
I created a 6GB file system on a USB flash drive to see if it would be
enough, and it was. It's easy enough to try a smaller partition size to
find what the threshold is.

On 04/07/17 14:49, Hendrik Boom wrote:
> 6GB is a ridiculous amount of space. I wonder how much of it yo really
> needed. Could some other people report how much /tmp space they had
> available during successful or failed jessie->ascii upgrades?
>
> -- hendrik
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