pyuic5: 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/pyuic5 - from package: pyqt5-dev-tools

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

Error in other languages:
pyuic5: bevel nie gevind nie
pyuic5: comandă negăsită
pyuic5: comando não encontrado
pyuic5: commande introuvable
pyuic5: command not found
pyuic5: käsku ei ole
pyuic5: không tìm thấy lệnh
pyuic5: komanda nerasta
pyuic5: Kommando nicht gefunden.
pyuic5: kommandot finns inte
pyuic5: komut yok
pyuic5: nie znaleziono polecenia
pyuic5: níor aimsíodh an t-ordú
pyuic5: no se encontró la orden
pyuic5: no s'ha trobat l'ordre
pyuic5: opdracht niet gevonden
pyuic5: parancs nem található
pyuic5: perintah tidak ditemukan
pyuic5: príkaz nenájdený
pyuic5: příkaz nenalezen
pyuic5: команда не найдена
pyuic5: командата не е открита
pyuic5: 命令找不到
pyuic5: コマンドが見つかりません