title: unable to run post-install scripts
body: <p>After I installed git I saw the following in a dialog, "unable to run post-install scripts". 
  Every time I open git bash I see the following on the bash:
  `</p>
  
  <pre><code>mkdir: cannot create directory '/dev/shm': Read-only file system
  
  Creating /dev/shm directory failed.
  POSIX semaphores and POSIX shared memory will not work
  
  mkdir: cannot create directory '/dev/mqueue': Read-only file system
  
  Creating /dev/mqueue directory failed.
  POSIX message queues will not work
  
  ln: failed to create symbolic link '/dev/stdin': Read-only file system
  ln: failed to create symbolic link '/dev/stdout': Read-only file system
  ln: failed to create symbolic link '/dev/stderr': Read-only file system
  ln: failed to create symbolic link '/dev/fd': Read-only file system
  ln: failed to create symbolic link '/etc/mtab': Permission denied
  'C:\Windows\system32\drivers\etc\hosts' -&gt; '/etc/hosts'
  /usr/bin/cp: cannot create regular file '/etc/hosts': Permission denied
  'C:\Windows\system32\drivers\etc\protocol' -&gt; '/etc/protocols'
  /usr/bin/cp: cannot create regular file '/etc/protocols': Permission denied
  'C:\Windows\system32\drivers\etc\services' -&gt; '/etc/services'
  /usr/bin/cp: cannot create regular file '/etc/services': Permission denied
  'C:\Windows\system32\drivers\etc\networks' -&gt; '/etc/networks'
  /usr/bin/cp: cannot create regular file '/etc/networks': Permission denied
  rm: cannot remove '/etc/post-install/01-devices.post': Permission denied
  rm: cannot remove '/etc/post-install/03-mtab.post': Permission denied
  rm: cannot remove '/etc/post-install/06-windows-files.post': Permission denied
  rm: cannot remove '/etc/post-install/99-post-install-cleanup.post': Permission denied
  </code></pre>
  
  <p>`
   what might be the problem? 
  Will give future hassles, especially while installing packages?</p>