xqueryx2xquery: command not found

Have You tried accessing the binary with the full path?

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/xqueryx2xquery - from package: galax-extra

You may install the required package with command apt-get install {package}
Error in other languages:
xqueryx2xquery: bevel nie gevind nie
xqueryx2xquery: comandă negăsită
xqueryx2xquery: comando não encontrado
xqueryx2xquery: commande introuvable
xqueryx2xquery: command not found
xqueryx2xquery: käsku ei ole
xqueryx2xquery: không tìm thấy lệnh
xqueryx2xquery: komanda nerasta
xqueryx2xquery: Kommando nicht gefunden.
xqueryx2xquery: kommandot finns inte
xqueryx2xquery: komut yok
xqueryx2xquery: nie znaleziono polecenia
xqueryx2xquery: níor aimsíodh an t-ordú
xqueryx2xquery: no se encontró la orden
xqueryx2xquery: no s'ha trobat l'ordre
xqueryx2xquery: opdracht niet gevonden
xqueryx2xquery: parancs nem található
xqueryx2xquery: perintah tidak ditemukan
xqueryx2xquery: príkaz nenájdený
xqueryx2xquery: příkaz nenalezen
xqueryx2xquery: команда не найдена
xqueryx2xquery: командата не е открита
xqueryx2xquery: 命令找不到
xqueryx2xquery: コマンドが見つかりません