Quoting the attached DpkgTerminalLog.txt:
install/namazu: Byte-compiling for xemacs21 ...emacs-install:
/usr/lib/emacsen-common/packages/install/namazu2 xemacs21 emacs23 failed at
/usr/lib/emacsen-common/emacs-install line 28, TSORT line 8.
dpkg: error processing xemacs21-nomule
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https://bugs.launchpad.net/bugs/796237
Title:
package xemacs21-nomule 21.4.22-3.1ubuntu1 failed to install/upgrade:
subprocess installed post-installation script returned error exit