leksahecho: 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/leksahecho - from package: leksah-server

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