I am running Odoo 11.0-20210922 CE on Ubuntu 16.04. After trying to import one of the xls import templates and getting this error Import preview failed due to: Unable to load "xls" file: requires Python module "xlrd".

I executed pip3 install xlrd and pip install xlrd because unsure about the Python version. Checked with pip3 show xlrd and pip show xlrd, which shows:

Metadata-Version: 2.0
Name: xlrd
Version: 1\.1\.0
Summary:\ Library\ for\ developers\ to\ extract\ data\ from\ Microsoft\ Excel\ \(tm\)\ spreadsheet\ files
Home\-page:\ http://www\.python\-excel\.org/
Author:\ John\ Machin
Author\-email:\ sjmachin@lexicon\.net
Installer:\ pip
License:\ BSD
Location:\ /home/user/\.local/lib/python3\.5/site\-packages

and

Metadata\-Version:\ 2\.0
Name:\ xlrd
Version:\ 1\.1\.0
Summary:\ Library\ for\ developers\ to\ extract\ data\ from\ Microsoft\ Excel\ \(tm\)\ spreadsheet\ files
Home\-page:\ http://www\.python\-excel\.org/
Author:\ John\ Machin
Author\-email:\ sjmachin@lexicon\.net
Installer:\ pip
License:\ BSD
Location:\ /home/user/\.local/lib/python2\.7/site\-packages



I\ first\ tried\ with\ the\ latest\ xlrd\ version\ \(2\.0\.1\)\ with\ no\ results,\ then\ I\ downgraded\ to\ 1.1.0

I've rebooted Ubuntu / restarted Odoo service in every case, but I keep getting the same error.

What am I missing?

Thanks.