young@jianyue:~/Downloads$ sudo apt-get install libgconf2-4 libnss3-1d libxss1
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package libgconf2-4 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 libnss3-1d 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
However the following packages replace it:
  libnss3

Package libxss1 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 'libgconf2-4' has no installation candidate
E: Package 'libnss3-1d' has no installation candidate
E: Package 'libxss1' has no installation candidate