lyx2lyx conversion failure

[Jim Burton]

I'm unable to open a file created in a 1.5.x version of Lyx in my older
one (1.4.3). The error message is that the file is from an older version
of Lyx  and lyx2lyx failed to convert it, but I understand that's a bug
in the message. This is the same problem as seen on the list here >>
http://www.mail-archive.com/lyx-users@lists.lyx.org/msg59950.html .
There, Jorge says that the latest 1.4.x will do this but I'm using the
package distributed with Ubuntu and want to stick with that for ease of
package management. Where can I find a copy of lyx2lyx that will convert
my file?

Thanks,

Jim