Jerome, for some reason I didn't see the message that said you posted
the file.
The file you posted looks entirely corrupt, being full of binary stuff.
If you have also Pico itself installed (beside nano), the content of
that file should look something like this:
auto
/usr/bin/pico
pico.1.gz
As requested
/var/lib/dpkg/alternatives/pico
** Attachment added: "/var/lib/dpkg/alternatives/pico"
https://bugs.launchpad.net/ubuntu/+source/nano/+bug/1667929/+attachment/4826658/+files/pico
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Please attach the file /var/lib/dpkg/alternatives/pico .
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https://bugs.launchpad.net/bugs/1667929
Title:
package nano 2.5.3-2ubuntu2 failed to install/upgrade: subprocess
installed
** Tags removed: need-duplicate-check
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https://bugs.launchpad.net/bugs/1667929
Title:
package nano 2.5.3-2ubuntu2 failed to install/upgrade: subprocess
installed post-installation
