pyside-uic: 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/pyside-uic - from package: pyside-tools

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

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