pkascii2ogr: 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/pkascii2ogr - from package: pktools

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

Error in other languages:
pkascii2ogr: bevel nie gevind nie
pkascii2ogr: comandă negăsită
pkascii2ogr: comando não encontrado
pkascii2ogr: commande introuvable
pkascii2ogr: command not found
pkascii2ogr: käsku ei ole
pkascii2ogr: không tìm thấy lệnh
pkascii2ogr: komanda nerasta
pkascii2ogr: Kommando nicht gefunden.
pkascii2ogr: kommandot finns inte
pkascii2ogr: komut yok
pkascii2ogr: nie znaleziono polecenia
pkascii2ogr: níor aimsíodh an t-ordú
pkascii2ogr: no se encontró la orden
pkascii2ogr: no s'ha trobat l'ordre
pkascii2ogr: opdracht niet gevonden
pkascii2ogr: parancs nem található
pkascii2ogr: perintah tidak ditemukan
pkascii2ogr: príkaz nenájdený
pkascii2ogr: příkaz nenalezen
pkascii2ogr: команда не найдена
pkascii2ogr: командата не е открита
pkascii2ogr: 命令找不到
pkascii2ogr: コマンドが見つかりません