> As far as I remember the image was supposed to be a Jessie one, though
> when I SSH to the Odroid the login is "odroid@odroid-wheezy".
cat /etc/debian_version
> Should I change all "jessie" to "wheezy" in /etc/apt/sources.list?
Not unless you are really running wheezy. It seems much more likely that
you just forgot what you have installed than somehow getting jessie
sources configured on a wheezy installation.