mincconvert: 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/mincconvert - from package: minc-tools

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

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