dselect: 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 CentOS possible default full paths are:

/usr/bin/dselect - from package: dselect

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/dselect - from package: dselect

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

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