We are ending support for the older and out-of-support “Jessie” distribution of Debian, and removing packages for that OS from our apt repository on October 1st 2020.
Please be aware that Jessie users who do not upgrade will experience an End Of Service halt of zcashd, version 3.1.0 will EOS halt at block height 1046024, near the end of October.
To install the latest version 4.0.0 zcashd debian package from ECC, please upgrade your base OS to debian “Stretch” or “Buster” and follow the installation instructions here Zcashd Debian Package Installation Instructions..
NOTE: If you are using “stretch” or “buster” already, and you are pointing at the “jessie” repo at apt.z.cash, now is a good time to update that file to point to the “stretch” repo instead. Our docs have recently been updated to reflect this change.