I have installed heroku toolbelt but each time I do "heroku login" or any other heroku command like "heroku version" I get something like : 

autoupdate:: 'EACCES': EACCES: permission denied, mkdir
▸ '/home/vanessa/.cache/heroku/update.lock.readers.lock'
▸ 'EACCES': EACCES: permission denied, open
▸ '/home/vanessa/.cache/heroku/plugins.json'
▸ 'EACCES': EACCES: permission denied, mkdir
▸ '/home/vanessa/.cache/heroku/update.lock.readers.lock'

I have deleted and reinstalled, I have also done sudo apt-get upgrade heroku to update the CLI, however I still get same results. My OS is Ubuntu Linux.