> It states that it depends on `gtk3-engines-unico` but > `gtk3-engines-unico` has no installation candidate.
I guess Debian doesn't have that package. You can grab it from the Trisquel repo too. http://archive.trisquel.info/trisquel/pool/main/g/gtk3-engines-unico/ If you have a 64-bit system download the one that says amd64. For 32-bit use the one that says i386. Install it with dpkg, and then try again to install trisquel-gtk-theme.
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