kuiserver: 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/kuiserver - from package: kdebase-runtime

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

On Debian possible default full paths are:

/usr/bin/kuiserver - from package: kde-runtime

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

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