qglinfo: 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/qglinfo - from package: qtchooser

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

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