add-apt-repository -y "ppa:openafs/stable"
apt-get update && apt-get upgrade

Type into the terminal window:

sudo apt-get install heimdal-clients openafs-client openafs-krb5

During the installation you'll be prompted to enter the 'Default Realm' of Kerberos. Enter in CAPITALS! please: MATH.UNI-HAMBURG.DE. Furthermore you need to enter the 'Default cell' of AFS. In small letters please enter: math.uni-hamburg.de.

After a reboot of the computer, AFS will start automatically, although it's possible to manually start the AFS service by typing the following into a terminal window:

sudo service openafs-client start

sudo sed -i "s/AFS_CLIENT=true/AFS_CLIENT=false/" /etc/openafs/afs.conf.client

sudo service openafs-client force-start

To access to the AFS, you first need to obtain a Kerberos ticket and an AFS token. Please enter the following commands into a terminal window:

• kinit <identifier>     e.g. kinit fmnv165 (for Kerberos ticket)
• aklog     (for AFS token)

If for any reasons the 'Default Realm' and / or 'Default Cell' should be different from those mentioned above, you can use the long versions of the commands. In a terminal window please enter the following:

• kinit <Kennung>@MATH.UNI-HAMBURG.DE     z.B. kinit fmnv165@MATH.UNI-HAMBURG.DE
• aklog math.uni-hamburg.de

Please note: This 'how-to' refers to the 64-bit version of Windows
Installation-programs for 32-bit Windows are available at the respective “original address”.

• EITHER (recommended)
  • Download of the most recent MIT Kerberos (Kerberos for Windows Release 4.1)
    (original address: http://web.mit.edu/kerberos/dist/)
  • Installation of kfw-4.1-amd64.msi
    Keep the default settings (“Typical”)
    At the end select “No - restart later”
• OR
  • Download of the most recent Heimdal
    (original address: https://www.secure-endpoints.com/heimdal/)
  • Installation of Heimdal-AMD64-full-1-6-2-0.msi
    Keep the default settings (“Typical”)
    
    
• Download of the most recent Network Identity Manager: (Network Identity Manager 2.0.102.907 64-bit MSI)
  (ursprüngliche Adresse: http://www.secure-endpoints.com/netidmgr/v2/)
• Installation of netidmgr-AMD64-rel-2_0_102_907.msi
  Custom Settings:
  • Keystore → “Entire Feature unavailable”
    
    
• Download of the most recent OpenAFS
  (original address: https://www.auristor.com/openafs/client-installer/
• Installation of yfs-openafs-en_US-AMD64-1_7_3301.msi
  Custom Settings:
  • Default Cell: “math.uni-hamburg.de”
  • Integrated Login: “Disable”

Now restart the computer.

• On the right side of the taskbar, there's an icon with a yellow padlock,​ which is currently overlayed with a red X. Open the Network Identity Manager (NIM) by a click on this icon
• The NIM has on the left a symbol with a yellow sun “​Obtain New Credentials”,​ klick it.
• Username: UHH-Account (e.g. fmsv030)
• Realm: MATH.UNI-HAMBURG.DE (must be in capital letters)
• Press three times ​Next ​ (The standards are mostly ok)
• Enter the Kerberos-Passwort of the Mathematics Department
• Click Finish

• Download of the most recent AFS version corresponding to the Mac OS X version:
  • for 10.8: OpenAFS-1.6.5-MountainLion.dmg
  • for 10.9: OpenAFS-1.6.11-Mavericks.dmg
  • for 10.10: OpenAFS-1.6.14-Yosemite.dmg
  • for 10.11: (there is currently no compatible AFS-Installer for El Capitan!)
• Open the .dmg file and install the contained .pkg file
  Please enter during installation (Cell): math.uni-hamburg.de
• Save the file krb5.conf into the home directory (WITHOUT the .txt extension, Safari might ask for this)
• As Root user copy this file (in a terminal window) to /etc/krb5.conf
  sudo cp ~/krb5.conf /etc/krb5.conf

• Click onto the “Apple”-symbol at upper left corner → System Settings → Other → OpenAFS
• In the OpenAFS window, below the “Tokens” - tab set the following checkmarks (see graphic):
  

  

• AFS Menu
• Backgrounder (responsible for monitoring the AFS-Tokens)
• use aklog
• get credential at login time (if desired)

• → When the installation is finished, a symbol in form of a small lock appears in the menu-bar at the upper right corner (see graphic). By clicking on it you can login to the AFS ('Get New Token') or watch the status of the AFS (red X: not connected to the AFS)
  
• To see a link to the AFS on the Desktop, you have to open the settings of the Finder in the section “Show these items on the desktop” and set a checkmark near “Connected Servers”