I should have mentioned that I'm now using Lubuntu 13.10 64-bit. The main download link on the seamonkey-project page is for 32-bit. Installing 32-bit Seamonkey on 64-bit Lubuntu seems to be rocket science. I found a 64-bit "contributed" build that installed smoothly. Shantiq has had success with a ppa as described in the second post.
I downloaded Seamonkey from http://www.seamonkey-project.org/releases/. After extracting seamonkey-2.21.tar.bz2, I used sudo mv seamonkey /usr/local/seamonkey to move the Seamonkey folder.
There are two executables and one script in that folder.
But double-clicking on either executable gives a pop-up window with:
-rwxr-xr-x 1 vasa1 vasa1 8915 Sep 17 00:01 run-mozilla.sh*
-rwxr-xr-x 1 vasa1 vasa1 760868 Sep 17 01:16 seamonkey*
-rwxr-xr-x 1 vasa1 vasa1 760872 Sep 17 01:16 seamonkey-bin*
Trying run-mozilla.sh gives:
Failed to execute file "seamonkey".
Failed to execute child process "/usr/local/seamonkey/seamonkey" (No such file or directory).
And running seamonkey or seamonkey-bin in the terminal gives:
run-mozilla.sh: Cannot execute .
I had no problem with Lubuntu 13.04 and Seamonkey from the same source.
bash: /usr/local/seamonkey/seamonkey: No such file or directory
bash: /usr/local/seamonkey/seamonkey-bin: No such file or directory
I modified `/etc/environment` to this:
but no joy even after a reboot.
vasa1@vasa1-Inspiron-1545:/usr/local/seamonkey$ cat /etc/environment