nepomuksearch: command not found

Have You tried accessing the binary with the full path?

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/nepomuksearch - from package: nepomuk-core-runtime

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