txtreader: 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/txtreader - from package: txtreader

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

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