[Bug 492822] Re: package arpalert 2.0.11-3 failed to install/upgrade: underprocess installerade pre-removal-skript gav felkod 2

[Jean-Baptiste Lallement]

>From this message, the error is with the prerm script
dpkg (underprocess): kunde inte köra installerade pre-removal-skript:
Formatfel på körbar fil
dpkg: fel vid hantering av arpalert (--purge):
 underprocess installerade pre-removal-skript gav felkod 2

This file is probably empty (0 bytes) . You can get rid of this package
by removing both prerm and postrm

$ sudo rm /var/lib/dpkg/info/arpalert.*rm
$ sudo apt-get remove --purge arpalert

Regarding arpwatch the message is different but it's also due to a corrupted file:
dpkg: varning: fillistfilen för paketet "arpwatch" saknas, antar att paketet inte har några filer installerade.

You can refer to bug 108189 which describes this issue and propose a
workaround.

Finally, the freeze is something different. Your system seems to freeze as soon as you access your network device under certain conditions (wireshark, arpalert, ...) 
If you find a way to reproduce this failure please report it by running the following command which will attach necessary information:

$ ubuntu-bug linux

Thanks.

-- 
package arpalert 2.0.11-3 failed to install/upgrade: underprocess installerade pre-removal-skript gav felkod 2
https://bugs.launchpad.net/bugs/492822
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