ucpp: 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 CentOS possible default full paths are:

/usr/lib64/libreoffice/sdk/bin/ucpp - from package: libreoffice-sdk
/usr/bin/ucpp - from package: ucpp

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/ucpp - from package: ucpp

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

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