All I can say is your OS appears to be broken.
@Luke
THX for your help BIG THX
After a reinstallation of libjansson the BfgMiner run with my BFx2 Bitfury but at the same time the Bfgminer do not scan my:
8 x BFx2 Bitfury
2 x Antminer U2+
??
My settings:
]
,
"api-listen" : true,
"api-port" : "4028",
"api-allow" : "W:0/0",
"expiry" : "120",
"failover-only" : true,
"log" : "5",
"no-pool-disable" : true,
"queue" : "2",
"scan-time" : "60",
"worktime" : true,
"shares" : "0",
"kernel-path" : "/usr/local/bin",
"scan" : ["antminer:all"],
"set-device" : ["antminer:clock=x0A81"],
"scan" : ["bfx:all"],
"set-device" : ["bfx:osc6_bits=53"]
}