That's because acidlab fails to install:
Setting up acidlab (0.9.6b20-22) ...
n installing acidlab from synapticjk
/usr/share/debconf/confmodule: line 55: return: installing: numeric argument
required
dpkg: error processing acidlab (--configure):
subprocess post-installation script returned error exit status 255
** Changed in: acidlab (Ubuntu)
Status: New => Confirmed
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acidlab crashes on install
https://bugs.launchpad.net/bugs/230073
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