[Please note that this post has been written quite a while ago. After that, it's not been updated.]

I failed to install UNAFold/mfold in Ubuntu 10.10 as the supplied binary package was in rpm (RedHat) format.

Ubuntu 10.10 can't use rpm files to install software directly.

After doing some online resource, I found that it is possible to convert rpm files to deb(Debian) format by using another app, named alien.

But alien isn't installed by default. So I used the command,

$sudo apt-get install alien

then checked the installation by command:

$alien

if it goes okay, now to simply convert the UNAFold package:

$sudo alien ~/Downloads/unafold-3.8-1.i386.rpm

the converted one is named like unafold_3.8-2_i386.deb

Now use this new package for installation

$sudo dpkg -i unafold_3.8-2_i386.deb

after installation, you should be able to run the *.pl scripts with appropriate input, like:

$perl /usr/bin/UNAFold.pl  ~/s1.seq