[SOLVED]sudo: unable to resolve host kasun~cse???

[kasunbg]

Yesterday I changed my hostname to 'kasun~cse' by editing the file /etc/hostname.

But after changing the filewhen I implement network related commands I get the following error .

sudo: unable to resolve host kasun~cse

I couldn't understand why this happens. Do I have to edit some more other names such as dnsdomainname as well
Please give me a solution for this.
Thanks.

[kubicle]

Re: sudo: unable to resolve host kasun~cse

If you change your /etc/hostname, you'll also have to make the change in /etc/hosts file for sudo to function.

Since you cannot edit /etc/hosts anymore (because sudo doesn't work), boot into recovery mode to get a root console, and edit /etc/hosts with nano (or the CLI editor of your choice) with 'nano /etc/hosts' and replace your old hostname with the new one (Ctrl+O will write your changes to disk). Then reboot with 'reboot'.

[kasunbg]

Re: sudo: unable to resolve host kasun~cse

Thanks for the help kubicle...
But what is the need to go to recovery mode

Since you cannot edit /etc/hosts anymore (because sudo doesn't work)

My sudo command works fine. Can't we change /etc/hosts file with it
I haven't tried it yet. Please reply!
Thanks...

[kubicle]

Re: sudo: unable to resolve host kasun~cse

My sudo command works fine. Can't we change /etc/hosts file with it

Sure...mismatching /etc/hostname and /etc/hosts used to render sudo inoperable, it might have been 'fixed'.

kdesudo kate /etc/hosts

[kasunbg]

Re: sudo: unable to resolve host kasun~cse

Thanks kubicle. it worked.