Instructions here: Home · zcash/zcash Wiki · GitHub
Our software signing key: https://apt.z.cash/zcash.asc
F1E2 1403 7E94 E950 BA85 77B2 63C4 A216 9C1B 2FA2
Let us know if there are any issues.
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Thanks a lot! Post is too short 
I just tried following the directions for this and got the following output at the end of a number of ‘Hit’ and ‘Get:’ entries…
Fetched 4,212 B in 5s (770 B/s)
W: Failed to fetch https://apt.z.cash/dists/jessie/Release Unable to find expected entry ‘main/binary-i386/Packages’ in Release file (Wrong sources.list entry or malformed file)
E: Some index files failed to download. They have been ignored, or old ones used instead.
@Voluntary hey there, thanks for writing in. Unfortunately, zcash is only available for 64-bit at this time. It looks like you are running a 32-bit kernel/OS.
Thank you for the feedback. My OS is Ubuntu 15.10 64bit. I’ve previously compiled and run zcash on it.
@Voluntary Could you try putting [arch=amd64] in your sources.list? e.g.
deb [arch=amd64] https://apt.z.cash/ jessie main
Thank you - that did the trick.
How fast after the next zcashd update the new package will be available? Does it contain and automatically upgrade the keys (900Mb or so)?
@counsellor Usually or ideally within 12 hours after the release is tagged on GitHub, after which some time is needed to run the deterministic build.
It doesn’t contain or update the keys automatically, but it updates the zcash-fetch-params script, so when we release the new zkSNARK parameters you’ll just have to run that manually.