showfont: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/showfont - from package: x11-xfs-utils

You may install the required package with command apt-get install {package}

Error in other languages:
showfont: bevel nie gevind nie
showfont: comandă negăsită
showfont: comando não encontrado
showfont: commande introuvable
showfont: command not found
showfont: käsku ei ole
showfont: không tìm thấy lệnh
showfont: komanda nerasta
showfont: Kommando nicht gefunden.
showfont: kommandot finns inte
showfont: komut yok
showfont: nie znaleziono polecenia
showfont: níor aimsíodh an t-ordú
showfont: no se encontró la orden
showfont: no s'ha trobat l'ordre
showfont: opdracht niet gevonden
showfont: parancs nem található
showfont: perintah tidak ditemukan
showfont: príkaz nenájdený
showfont: příkaz nenalezen
showfont: команда не найдена
showfont: командата не е открита
showfont: 命令找不到
showfont: コマンドが見つかりません