mediawiki2latex-pyqt: 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/mediawiki2latex-pyqt - from package: mediawiki2latexguipyqt

You may install the required package with command apt-get install {package}
Error in other languages:
mediawiki2latex-pyqt: bevel nie gevind nie
mediawiki2latex-pyqt: comandă negăsită
mediawiki2latex-pyqt: comando não encontrado
mediawiki2latex-pyqt: commande introuvable
mediawiki2latex-pyqt: command not found
mediawiki2latex-pyqt: käsku ei ole
mediawiki2latex-pyqt: không tìm thấy lệnh
mediawiki2latex-pyqt: komanda nerasta
mediawiki2latex-pyqt: Kommando nicht gefunden.
mediawiki2latex-pyqt: kommandot finns inte
mediawiki2latex-pyqt: komut yok
mediawiki2latex-pyqt: nie znaleziono polecenia
mediawiki2latex-pyqt: níor aimsíodh an t-ordú
mediawiki2latex-pyqt: no se encontró la orden
mediawiki2latex-pyqt: no s'ha trobat l'ordre
mediawiki2latex-pyqt: opdracht niet gevonden
mediawiki2latex-pyqt: parancs nem található
mediawiki2latex-pyqt: perintah tidak ditemukan
mediawiki2latex-pyqt: príkaz nenájdený
mediawiki2latex-pyqt: příkaz nenalezen
mediawiki2latex-pyqt: команда не найдена
mediawiki2latex-pyqt: командата не е открита
mediawiki2latex-pyqt: 命令找不到
mediawiki2latex-pyqt: コマンドが見つかりません