tkinfo: 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/tkinfo - from package: tkinfo

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

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