[ ubuntu ] enable bluetooth using command line

Problem

$ hcitool scan
Device is not available: No such device

Try

$ hciconfig dev
hci0:	Type: BR/EDR  Bus: USB
	BD Address: 00:21:86:4A:84:81  ACL MTU: 310:10  SCO MTU: 64:8
	DOWN 
	RX bytes:466 acl:0 sco:0 events:18 errors:0
	TX bytes:73 acl:0 sco:0 commands:17 errors:0

Solution

$ sudo hciconfig hci0 reset

Check

$ hcitool scan
Scanning ...

Now it works !
ref : https://bbs.archlinux.org/viewtopic.php?id=126603

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