texconfig-dialog: 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/texconfig-dialog - from package: texlive

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

On Debian possible default full paths are:

/usr/bin/texconfig-dialog - from package: texlive-base

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

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