gchemtable: 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/gchemtable - from package: gcu-bin

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

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