Tails Installer requires syslinux 6.x that is not in Ubuntu trusty

trusty has 3:4.05+dfsg-6+deb8u1, Tails Installer needs syslinux 6.x. What do we do about it?

By the way, the installer has a depends on syslinux (>= 6.03), which should prevent installing on trusty, but it might not work due to the epoch.

Original created by @intrigeri on 10602 (Redmine)

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