Neither cgminer nor BFGminer detect my Zeusminer Blizzard. (Ubuntu/Linux/Mint)
There are a few things that might be going wrong.   

First, are you sure that your user has rights to read and write the serial port?  (There are plenty of tutorials online about how to do this.)  You can check if that is the problem by running (temporarily) as root.  If it starts to work, then you can go back and sort out how to give your user rights to the serial port.

Second, your command line looks like it may be wrong.   I say "may" because it depends on whose version of bfgminer you are running with.   My recommendation is to get the official one from the Github site and build it.   Assuming that is the one you have, then you need to call the miners zeusminer instead of just zeus.   You should also be using -o to define your pool, not --set.

Third, you need to tell bfgminer to operate in scrypt mode, or it will default to SHA256 mode.  This is done by adding the --scrypt command line option.

Try this command line :

sudo /home/me/crypto/bfgminer/bfgminer --scrypt -S zeusminer:all --set zeusminer:clock=340 -o stratum+tcp://mypool.com:6030 -u myuser -p mypass


I just fired up two Blizzard using a command line very similar to this.  (The only difference is I use the -O option to pass my user name and password together.)