dpkg
37
Available Packages File Management Options
dpkg and dselect both use the available packages information found in the file
/var/lib/dpkg/available. This file is constructed from the Packages file found
in the binary, contrib, and non free sections of these archives. There are several
tools that dpkg provides, as options, for creating and managing this file.
  clear avail
dpkg will clear the available packages file of all information when given this
option. There are times when the current file has been corrupted or otherwise
broken in some fashion. This can happen for a number of reasons.
The most common reason is that it has gotten updated from a  broken  Pack 
ages file. In extreme cases, changes to the file format have resulted in files that
failed to work with the old version of dpkg. This requires that the new version
be installed before the file can be fixed. Cleaning out this file allows the up 
grade to go forward. Once completed the available file can again be updated
with the new Packages format and the installation may progress unhindered.
Executing the command:
dpkg   clear avail
is a way to clean the slate and start over from scratch and will typically be
followed by a dpkg   merge avail command.
 A |   avail 
This will add the package information, found in the .deb file pointed to by
, to the available file. So the command:
dpkg  A /usr/local/Debian/archive/joe 2.8 7.deb






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