XML Copy Editor is a fast, free, validating XML editor.

If you have tried and failed to install it on your Ubuntu, don't worry.

The version available on the official website XML Copy Editor use an old version of "libxerces" and this one, in turn, depends on an old version of "libcu".

So, what you should do is not to download the version available on the official site.

Step 1:
Open the Ubuntu Software Center

Step 2:
Type "XML Copy Editor" or "xmlcopyeditor" on the search bar.

Step 3:
Click Install.

That's it!

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Alternative steps:

If you can not install using the steps above, perform the following steps:

Step 1:
Access http://packages.ubuntu.com/karmic/i3...icu40/download
Download the 'libicu40_4.0.1-2ubuntu2_i386.deb' from your preferred mirror and install it (double click).

Step 2:
Access http://packages.ubuntu.com/karmic/i3...-c3.0/download
Download the 'libxerces-c3.0_3.0.1-2_i386.deb' from your preferred mirror and install it (double click).

Step 3:
Access https://sourceforge.net/projects/xml...6.deb/download to download the latest version of XML Copy Editor
And double click to install.

That's it!