Kevin O'Gorman wrote:

> CREATE INDEX has two problems:
> 1) poor default location of temporary storage.
> 2) gets wedged on very large indexes.
>
> I'm using the sqlite that came with Xubuntu 14.04, I think it's version
> 3.8.2.

SQLite-3.8.2 is old (Dec 2013). It's better to download and
compile SQLite yourself.

There has been several optimizations since that release.
In particular, looking at release notes at
https://sqlite.org/changes.html the following
improvement which may be relevant for your issue:

=== BEGIN QUOTE https://sqlite.org/changes.html ===
3.8.10:

Performance improvements for ORDER BY, VACUUM,
CREATE INDEX, PRAGMA integrity_check, and
PRAGMA quick_check.
=== END QUOTE ===

Regards
Dominique
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