Hi,
I have also added the hugo executable to the bin folder, now in my ubuntu, globally i have this result,
balachandiran@tensketch:~$ hugo version
hugo v0.88.1-5BC54738+extended linux/amd64 BuildDate=2021-09-04T09:39:19Z VendorInfo=gohugoio
balachandiran@tensketch:~$
I tested on 2 Ubuntu systems, one of them a virgin installation using Hugo installed via brew. I also tested on Windows 10. I suspect the error is due to something unique on your Ubuntu instance.
Also, you are obviously missing a number of templates:
WARN 2021/09/29 11:32:01 found no layout file for "HTML" for kind "page": You should create a template file which matches Hugo Layouts Lookup Rules for this combination.
WARN 2021/09/29 11:32:01 found no layout file for "HTML" for kind "page": You should create a template file which matches Hugo Layouts Lookup Rules for this combination.
WARN 2021/09/29 11:32:01 found no layout file for "HTML" for kind "page": You should create a template file which matches Hugo Layouts Lookup Rules for this combination.
WARN 2021/09/29 11:32:01 found no layout file for "HTML" for kind "page": You should create a template file which matches Hugo Layouts Lookup Rules for this combination.
WARN 2021/09/29 11:32:01 found no layout file for "HTML" for kind "page": You should create a template file which matches Hugo Layouts Lookup Rules for this combination.
WARN 2021/09/29 11:32:01 found no layout file for "HTML" for kind "term": You should create a template file which matches Hugo Layouts Lookup Rules for this combination.
WARN 2021/09/29 11:32:01 found no layout file for "HTML" for kind "section": You should create a template file which matches Hugo Layouts Lookup Rules for this combination.
WARN 2021/09/29 11:32:01 found no layout file for "HTML" for kind "taxonomy": You should create a template file which matches Hugo Layouts Lookup Rules for this combination.
WARN 2021/09/29 11:32:01 found no layout file for "HTML" for kind "taxonomy": You should create a template file which matches Hugo Layouts Lookup Rules for this combination.
WARN 2021/09/29 11:32:01 found no layout file for "HTML" for kind "taxonomy": You should create a template file which matches Hugo Layouts Lookup Rules for this combination.
WARN 2021/09/29 11:32:01 found no layout file for "HTML" for kind "taxonomy": You should create a template file which matches Hugo Layouts Lookup Rules for this combination.