lsconv: 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/lsconv - from package: drc

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

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