After I enter sudo command in command-line it shows this error :
unable to resolve host linux98
linux98 is my PC name. i have tried these solution too : Error message when I run sudo: unable to resolve host (none) and Error message when I run sudo: unable to resolve host (none) but it did'nt solve my problem. please help me !
/etc/hostnameand/etc/hosts, please? – anonymous2 Jun 22 '16 at 14:17