tegaki-convert: 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/tegaki-convert - from package: python-tegakitools

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

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