KeePassX 2 was in beta until only a couple months ago, long after Ubuntu 14.04 (the version of Ubuntu Trisquel 7 is based on) was released. New versions of programs don't get included in stable distros like Ubuntu and Trisquel after a version of the system has been released, so the version of any actively developed program is likely to be a bit old.

For now, you could use KeePass 2 instead (package "keepass2").

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