unable to zip download zip file from archive manager

What file name are you manipulating and what are you expecting it to be?

 I downloaded from the oracle website the {linux.x64_11gR2_database_2of2(1).zip} And after the download completed. The following error displayed.

[/home/demetrius/Downloads/linux.x64_11gR2_database_2of2(1).zip
  End-of-central-directory signature not found. Either this file is not
  a zipfile, or it constitutes one disk of a multi-part archive. In the
  latter case the central directory and zipfile comment will be found on
  the last disk(s) of this archive.
zipinfo: cannot find zipfile directory in one of /home/demetrius/Downloads/linux.x64_11gR2_database_2of2(1).zip or
          /home/demetrius/Downloads/linux.x64_11gR2_database_2of2(1).zip.zip, and cannot find /home/demetrius/Downloads/linux.x64_11gR2_database_2of2(1).zip.ZIP, period.

sounds like you downloaded a file for windoze.
they should have a deb file for ubuntu. look for that one instead of the zip file.

It's the correct file, but the name seems to have been changed. There's an extra '(1)' just before '.'

This might mean that you have, or had, extra copies of the file in the directory. I don't know if the name change will cause the decompression program problems. The zip file contains .rpm installation files and I don't think that there are any .deb files available from oracle.

You should make sure that both the filenames were as they were or as they are intended to be. It appears to be a multi part zip archive so everything would need to be spot on for it to work. Check the cksum on both part 1 and part 2 as given on the download pages to make sure the download was good. Email oracle and tell them that their unzip utility page is broken - it could be that they've used some specific program that you will need to get to unzip the files. Check the quick start guide and the documentation to see if there's other information. You might also try some different unzip utilities in case it is just fileroller and unzip that is having trouble with the way Oracle have made the zip files. I seem to recall using p7zip in the past when I had difficulties but that was some time ago.

Chris

What is the output of:

lsb_release -a; uname -a

Thanks