halo linuxer ...

saya mau ganti password di linux kok nggak bisa ya ???

munculnya :

bash$ passwd
Changing password for bert199
(current) UNIX password: 
New UNIX password: 
Retype new UNIX password: 
passwd: Permission denied
bash$ 


nb : bert199 adalah nama account saya , dan ketik passwd-nya di home
saya(bert199).

~~~
mohon pencerahan..TIA


------------------------------------------------------------
"...and then, suddenly, there it was. It was an Epiphany.
 A moment. A beautiful, golden moment of crystalline clarity,
 and I knew what I wanted-and I knew what I had to do."



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