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Re:LyX – The Document Processor by 88e282102ae2e5b on Sunday February 14, 2016 @09:03PM (#11101099)
You can try adding --no-install-recommends which gets it down to 55 MB, though I balked when it asked me if I wanted to install unauthenticated packages.
Re:LyX – The Document Processor by lwf on Sunday February 14, 2016 @09:18PM (#11101154)
That sounds like a local caching issue — an `apt-get update` first usually fixes that for me.

Or, you have a third-party APT repository specified in `/etc/apt/sources.list{,.d/*}` that you didn't install the keys for.

Or the NSA.