I am trying to install
sudo apt-get install libx11-dev
Then got the following error;
Reading package lists... Done Building dependency tree Reading state information... Done Package libx11-dev 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 'libx11-dev' has no installation candidate
I have no idea how to deal it, What should I do ?