Re: PW change fail, no space left on device?

ok so i have successfully reinstalled via failsafe and set my password for ssh. now i am haveing the
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"@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
e6:f6:b8:5b:7c:4e:9a:ae:fe:c6:91:92:67:da:63:c2.
Please contact your system administrator.
Add correct host key in /root/.ssh/known_hosts to get rid of this message.
Offending RSA key in /root/.ssh/known_hosts:1
RSA host key for 192.168.1.1 has changed and you have requested strict checking.
Host key verification failed.
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i searched the forum and found the "post-install issue" topic from "skaggsr" where he fixed this issue by running rm /root/.ssh/known_hosts. when i run this on my machine "ubuntu 14.04" i get...
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zule@zulebox-NULL:~$ sudo rm /root/.ssh/known_hosts
[sudo] password for zule:
rm: cannot remove ‘/root/.ssh/known_hosts’: No such file or directory
zule@zulebox-NULL:~$
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so, Mr.Strubel (or anyone of help) now what?