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Unable to Install Package from Internet (Error. E: Package has no candidate)


susanta@susanta-desktop:~$ sudo apt-get install nfs-common nfs-kernel-server
[sudo] password for susanta:
Reading package lists... Done
Building dependency tree      
Reading state information... Done
Package nfs-common 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
Package nfs-kernel-server 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 'nfs-common' has no installation candidate
E: Package 'nfs-kernel-server' has no installation candidate



susanta@susanta-desktop:~$ sudo apt-get update

Before execute the apt-get update command, please change few setting of software source in Ubuntu as below,