fathom: 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/fathom - from package: snap

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

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