linsmith: 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/linsmith - from package: linsmith

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

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