dissimilarity_mtx_stats.py: 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/lib/qiime/bin/dissimilarity_mtx_stats.py - from package: qiime

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

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