unopkg: 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/bin/unopkg - from package: libreoffice-core

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

On Debian possible default full paths are:

/usr/bin/unopkg - from package: libreoffice-common

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

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