pinentry-kwallet: 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/pinentry-kwallet - from package: kwalletcli

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

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