First installation or upgrade of Dollar Universe on Linux fails.
On the maintenance.log this error appears:
-----> Please check : That the 32 bits library "libidn" was correctly installed on this system
Else, the following may appear in the installer output:
/tmp/du_as_6.9.XX_linux_26_64/tools/unitestprerq: error while loading shared libraries: libidn.so
.11: cannot open shared object file: No such file or directory