wicd: 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/sbin/wicd - from package: wicd-common

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

On Debian possible default full paths are:

/usr/sbin/wicd - from package: wicd-daemon

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

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