TrimmomaticPE: 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/TrimmomaticPE - from package: trimmomatic

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

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