└─$ NAME_1-get install linux-headers - uname –r
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Package linux-headers is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source

E: Package 'linux-headers' has no installation candidate
E: Unable to locate package uname
E: Unable to locate package –r
 Avoid using the following keywords: name_1, source, tree, install
user