saods9 package require base64

i have been running ds9 on Ubuntu, but got some massage error.

Error in startup script: can't find package base64 while executing "package require base64" (file "/usr/share/saods9/library/ds9.tcl" line 216)

Can you help me to fix it? Thank you.

See https://heasarc.gsfc.nasa.gov/lheasoft/issues.html (formatting my own):

Ubuntu ds9 & HEASoft:

After initializing HEASoft on Ubuntu Linux, the ds9 GUI (if installed) may fail to start up (mentioning can't find package xml, can't find package uri 1.1, or package require base64). This results from incompatibilities between the Tcl/Tk included with HEASoft and the Ubuntu system libraries. Until a more elegant solution can be devised, we recommend that users try one of the following options, depending on the file type of your ds9 (shell script or compiled executable - check the output from file `which ds9` to determine which it is):

1. If ds9 is the shell script version, edit it to change the line

   exec wish8.6 -f ${DS9_HOME-/usr/share/saods9}/library/ds9.tcl $*
   

   to

   exec /usr/bin/env -u LD_LIBRARY_PATH /usr/bin/wish8.6 -f ${DS9_HOME-/usr/share/saods9}/library/ds9.tcl $*
   

or

2. If ds9 is the compiled executable version, create a new file
   $HEADAS/bin/ds9 containing the following lines:

   #!/bin/sh
   exec /usr/bin/env -u LD_LIBRARY_PATH /usr/bin/ds9 "$@"
   

   (Note this assumes that which ds9 = /usr/bin/ds9)

   To make the new script executable, run the following command:

   $ chmod +x $HEADAS/bin/ds9
   

   Then, as long as $HEADAS/bin is ahead of /usr/bin in your PATH, you should now be able to successfully run ds9 from the command line:

   $ rehash
   $ ds9