where are the modules in 2.4.20?

[Adam Myrow]

You obviously didn't do "make modules" and "make modules_install."  The
order I suggest for a kernel is "make bzImage."  Copy the bzImage and
System.map to the place where the old ones are, backing up the old ones
first.  Then, do the "make modules" and "make modules_install."  Another
thing is that if you compile the same kernel more than once, remove the
old modules before installing the new ones.  For example, Slackware 9
ships with kernel 2.4.20.  If you build a custom kernel from it and
install its modules without removing the old ones, there will be lots and
lots of errors about undefined symbols.  Either remove or rename the
directory for your modules before installing a new kernel.  I always
prefer to rename and keep it around until I'm sure the new kernel works
right.