How to fix WARNING terminal is not fully functional

The problem is caused by there being no entry for the current $TERM under /usr/share/terminfo.

To fix the problem:

1. Find out the current $TERM by  echo $TERM
2. As a quick and dirty fix – maybe "good enough" – create a symlink in the appropriate subdirectory of /usr/share/terminfo to the file for a similar terminal.  For example:
   # echo $TERM
   

   rxvt-unicode-256color

   # cd /usr/share/terminfo/r/

   /usr/share/terminfo/r# ls

   [snip output which included rxvt-256color]

   /usr/share/terminfo/r# ln -s rxvt-256color rxvt-unicode-256color

3. For a proper fix, find a terminfo file for the current $TERM's terminal type.  If it is not already compiled, the tic command can be used to compile it.