xminicom: 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 CentOS possible default full paths are:

/usr/bin/xminicom - from package: minicom

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/xminicom - from package: minicom

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

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