This looks to me more like something that's seriously wrong with your
system rather than a problem with the package:
Setting up libkadm5clnt6 (1.7dfsg~beta3-1ubuntu0.6) ...
dpkg (subprocess): unable to execute installed post-installation script:
Exec format error
The postinst script for that particular package should be just a regular
shell script. That sounds like disk corruption or some similar problem
which is making the postinst script look like a corrupt binary.
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package libkadm5clnt6 1.7dfsg~beta3-1ubuntu0.6 failed to install/upgrade:
https://bugs.launchpad.net/bugs/625651
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