static build errors

[davidwyld]

When running hugo -D to build the static pages, the following errors are encountered:

Building sites … ERROR 2020/09/29 09:57:15 Failed to add template "partials/menu.html" in path "/home/ac1dwi/playground/rse-workshop-materials-template/layouts/partials/menu.html": template: partials/menu.html:98: unexpected "=" in operand
ERROR 2020/09/29 09:57:15 partials/menu.html : template: partials/menu.html:98: unexpected "=" in operand
ERROR 2020/09/29 09:57:15 Unable to locate template for shortcode "fragment" in page "01-getting-started/slides/index.en.md"
ERROR 2020/09/29 09:57:15 Unable to locate template for shortcode "notice" in page "setup/_index.md"
ERROR 2020/09/29 09:57:15 Unable to locate template for shortcode "notice" in page "setup/github/_index.en.md"
Total in 15 ms
Error: Error building site: logged 5 error(s)

OS: Ubuntu 18.04
Hugo version Hugo Static Site Generator v0.40.1 linux/amd64 BuildDate: 2018-04-25T17:16:11Z
Go version go version go1.10.4 linux/amd64

NOTE: this is installed via the unrecommended apt method