startlazarus-1.2.4: 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/startlazarus-1.2.4 - from package: lazarus-ide-1.2.4

You may install the required package with command apt-get install {package}
Error in other languages:
startlazarus-1.2.4: bevel nie gevind nie
startlazarus-1.2.4: comandă negăsită
startlazarus-1.2.4: comando não encontrado
startlazarus-1.2.4: commande introuvable
startlazarus-1.2.4: command not found
startlazarus-1.2.4: käsku ei ole
startlazarus-1.2.4: không tìm thấy lệnh
startlazarus-1.2.4: komanda nerasta
startlazarus-1.2.4: Kommando nicht gefunden.
startlazarus-1.2.4: kommandot finns inte
startlazarus-1.2.4: komut yok
startlazarus-1.2.4: nie znaleziono polecenia
startlazarus-1.2.4: níor aimsíodh an t-ordú
startlazarus-1.2.4: no se encontró la orden
startlazarus-1.2.4: no s'ha trobat l'ordre
startlazarus-1.2.4: opdracht niet gevonden
startlazarus-1.2.4: parancs nem található
startlazarus-1.2.4: perintah tidak ditemukan
startlazarus-1.2.4: príkaz nenájdený
startlazarus-1.2.4: příkaz nenalezen
startlazarus-1.2.4: команда не найдена
startlazarus-1.2.4: командата не е открита
startlazarus-1.2.4: 命令找不到
startlazarus-1.2.4: コマンドが見つかりません