col5: 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/col5 - from package: byobu

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

Error in other languages:
col5: bevel nie gevind nie
col5: comandă negăsită
col5: comando não encontrado
col5: commande introuvable
col5: command not found
col5: käsku ei ole
col5: không tìm thấy lệnh
col5: komanda nerasta
col5: Kommando nicht gefunden.
col5: kommandot finns inte
col5: komut yok
col5: nie znaleziono polecenia
col5: níor aimsíodh an t-ordú
col5: no se encontró la orden
col5: no s'ha trobat l'ordre
col5: opdracht niet gevonden
col5: parancs nem található
col5: perintah tidak ditemukan
col5: príkaz nenájdený
col5: příkaz nenalezen
col5: команда не найдена
col5: командата не е открита
col5: 命令找不到
col5: コマンドが見つかりません