fig4latex: 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/fig4latex - from package: texlive-pictures

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

Error in other languages:
fig4latex: bevel nie gevind nie
fig4latex: comandă negăsită
fig4latex: comando não encontrado
fig4latex: commande introuvable
fig4latex: command not found
fig4latex: käsku ei ole
fig4latex: không tìm thấy lệnh
fig4latex: komanda nerasta
fig4latex: Kommando nicht gefunden.
fig4latex: kommandot finns inte
fig4latex: komut yok
fig4latex: nie znaleziono polecenia
fig4latex: níor aimsíodh an t-ordú
fig4latex: no se encontró la orden
fig4latex: no s'ha trobat l'ordre
fig4latex: opdracht niet gevonden
fig4latex: parancs nem található
fig4latex: perintah tidak ditemukan
fig4latex: príkaz nenájdený
fig4latex: příkaz nenalezen
fig4latex: команда не найдена
fig4latex: командата не е открита
fig4latex: 命令找不到
fig4latex: コマンドが見つかりません