Bugs: ds9, dax, and XPA

error while loading shared libraries: libxml2.so.2: cannot open shared object file: No such file or directory

The DS9 exectutable included in CIAO 4.18 is likely to not work on any Linux OS using a recent version of libxml2 (2.14.0 or later), such as Ubuntu 25.10.

Workaround:

The platform support page provides information on how to avoid this problem.

CIAO users should not enable either of the following options in their preferences:

Menus and Buttons → File → Menu → Preserve During Load → Pan
Menus and Buttons → File → Menu → Preserve During Load → Region

Due to the way CIAO starts ds9, having these preferences enabled leads to a half-pixel shift in regions. This shift accumulates if the region file is saved and re-loaded.

Workaround:

You can specify a unique name for each ds9 when it is launched

unix% ds9 -title snrs file_1.fits &
unix% ds9 -title grbs file_2.fits &