I succesfully installed Zdash GUI wallet on Linux Mint !  I am not a technical guy, and relatively new to Linux, but it shows it's possible even for new users.  There was some tweaking needed to adapt it to this Linux distro. Later, if there is some need, I could post a small tutorial on how to do the installation for Linux Mint users.

The main setback I have for now is I can only use transparent addresses because my laptop has only 3 GB of RAM. It nearly crashes each time I try to send to/receive from a private address. It looks like 4-8 GB of RAM is the minimum needed for private transactions. But at least I can store my Zdash in the wallet in the waiting for a better computer.  That's ok for now, as Cryptopia can only manage transparent addresses anyway (whether for deposit or withdrawal).

I only have a small issue for which I'm requesting a bit of help :  I only have 3 active connections to the network.  How can I increase the number of connections, and what will be the benefit of having more connections ?  I am not mining, I just setup a basic configuration file containing only :
rpcuser=zcashrpc
rpcpassword=XXXXXXXXXXXXXXXXXXXXXXX

My guess is I have to add some nodes addresses in that file, but I'm not sure of this, and how to do it properly.  Any advice is welcome.