Sometime It can be due to folder access error.
In odoo.conf or somename.conf (config) file you can see the data_dir = xxx
so make sure the runner user (you) can have access to those folder xxx

Hello,

insatll this required packges 
sudo apt-get install python-dev python3-dev libxml2-dev libxslt1-dev zlib1g-dev libsasl2-dev libldap2-dev build-essential libssl-dev libffi-dev libmysqlclient-dev libjpeg-dev libpq-dev libjpeg8-dev liblcms2-dev libblas-dev libatlas-base-dev
sudo apt-get install -y npm
sudo ln -s /usr/bin/nodejs /usr/bin/node
sudo npm install -g less less-plugin-clean-css
sudo apt-get install -y node-less

if still not then istall libass packge as well 
pip3 install libsass==0.12.3