I experienced the same failure after upgrading from Ubuntu 11.10 to 12.04:
$ sudo -u backup amcheck elijah
[sudo] password for andy: *********
Amanda Tape Server Host Check
-----------------------------
Holding disk /var/backups/amanda/holding: 35045376 kB disk space available, using 24559616 kB
**
ERROR:glib-util.c:45:glib_init: assertion failed: (!g_thread_supported())
amcheck-device terminated with signal 6Server check took 3.226 seconds
I experienced the same failure after upgrading from Ubuntu 11.10 to 12.04:
$ sudo -u backup amcheck elijah ------- ------- ------- - amanda/ holding: 35045376 kB disk space available, using 24559616 kB util.c: 45:glib_ init: assertion failed: (!g_thread_ supported( ))
[sudo] password for andy: *********
Amanda Tape Server Host Check
-------
Holding disk /var/backups/
**
ERROR:glib-
amcheck-device terminated with signal 6Server check took 3.226 seconds
Amanda Backup Client Hosts Check ------- ------- ------- ----
-------
Client check: 1 host checked in 1.493 seconds. 0 problems found.
(brought to you by Amanda 3.3.0)