Synaptic Package Manager

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Hello,

My Synaptic Package Manager, during an upgrade and installation of various
packages, stopped at Java 5.0 and froze. After it stopped responding, I
attempted to reopen Synaptic Package Manager, and it called an error and
asked me to run a manual dpkg --install -a. Having no luck at finding the
folder containing or titled Synaptic Packages Manager, I tried executing a
general dpkg --install -a, and it gave the response that:

dpkg: --install needs at least one package archive file argument

Type dpkg --help for help about installing and deinstalling packages[*];
Use `dselect' or `aptitude' for user-friendly package management;
Type dpkg -Dhelp for a list of dpkg debug flag values;
Type dpkg --force-help for a list of forcing options;
Type dpkg-deb --help for help about manipulating *.deb files;
Type dpkg --license for copyright license and lack of warranty (GNU GPL)[*].

Options marked[*] produce a lot of output - pipe it through `less' or
`more'

Please, if any of you are able, help me resolve this problem so I can
re-enable my Synaptic Package Manager and Update Manager.