nepomukserver: 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/nepomukserver - from package: kdebase-runtime

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

On Debian possible default full paths are:

/usr/bin/nepomukserver - from package: nepomuk-core-runtime

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

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