csdp-theta: 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 Debian possible default full paths are:

/usr/bin/csdp-theta - from package: coinor-csdp

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

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