You don't have to publish any source code because all of it is in Trisquel's repos. However, if someone would prefer source on a physical disk, you have to give it to them. On the other hand, if the people you're giving it away to are unlikely to have Internet access, it's probably best to give away a source DVD.
See this faq:
https://www.gnu.org/licenses/gpl-faq.html#DistributeWithSourceOnInternet.
- [Trisquel-users] Giving Away Trisquel? susanbryce11
- Re: [Trisquel-users] Giving Away Trisquel? legimet . calc
- Re: [Trisquel-users] Giving Away Trisquel? mikko . viinamaki
- [Trisquel-users] Re : Giving Away Trisquel? magicbanana
- Re: [Trisquel-users] Giving Away Trisquel? susanbryce11
- Re: [Trisquel-users] Giving Away Trisqu... legimet . calc
- Re: [Trisquel-users] Giving Away T... susanbryce11
- Re: [Trisquel-users] Giving Aw... mikko . viinamaki
- Re: [Trisquel-users] Giving Away Trisquel? susanbryce11
- Re: [Trisquel-users] Giving Away Trisquel? legimet . calc