Ubuntu – KDE Wallet & Keychain

I solved this issue by going into the network manager settings by clicking the wifi/network icon in the taskbar > Settings icon, and then from the networks screen that appears, I right-clicked my connection, clicked edit, and then under the "General configuration" tab, ticked the "All users may connect to this network" check box. When I restarted my computer, I wasn't asked to enter the kwallet password and connected to my network automatically.

Perhaps this solution may also solve the problem you are having with kwallet.

There is no way to tell mount which program to use for storing/reading passwords, but there are a few KDE tools you can combine to automate the process.

For storing/reading passwords: kwalletcli
For a GUI password prompt: kdialog
You should be able to install them with your package manager.

I wrote a script that does this (with a few extra options). It should be doing everything you asked for: if the password does not exist, a GUI prompt is shown (if available) and the password is stored in a wallet for later use.

You can update the password from the command line with kwalletcli again, but the only way I could find to delete them is the KWalletManager GUI app.

Here's the script as of 2020-08-22:

#!/bin/sh

usage() {
    echo "Usage: $0 [-u username] [-o options] share mount"
    echo
    echo "Defaults for optional parameters:"
    echo
    echo "  username:  the output of 'id -un', i.e. the current user"
    echo "  options:   defaults,uid=1000,gid=1000,iocharset=utf8"
    echo "             Pass an empty string to clear default options"
    exit 2
}

while getopts "u:o:" opt; do
    case "$opt" in
        u) USERNAME="$OPTARG" ;;
        o) OPTIONS="$OPTARG" ;;
        *) usage ;;
    esac
done
shift $((OPTIND-1))

[ "$#" -ne 2 ] && usage

# Mount settings
USERNAME="${USERNAME:-$(id -un)}"
OPTIONS="${OPTIONS-defaults,uid=1000,gid=1000,iocharset=utf8}"
SHARE="$1"
MOUNT="$2"

# Wallet settings
FOLDER="CIFS credentials"
ENTRY="$USERNAME@${SHARE#//}"

read_password() {
    PASS_PROMPT="Password for $USERNAME@${SHARE#//}: "

    if command -v kdialog >/dev/null 2>&1; then
        PASSWORD="$(kdialog --password "$PASS_PROMPT")"
    else
        # from https://stackoverflow.com/a/28393320/6702490
        trap 'stty echo' EXIT
        stty -echo
        printf "%s" "$PASS_PROMPT"
        read -r PASSWORD
        printf "\n"
        stty echo
        trap - EXIT
    fi
}

if ! PASSWORD="$(kwalletcli -f "$FOLDER" -e "$ENTRY" 2>/dev/null)"; then
    if read_password && [ -n "$PASSWORD" ]; then
        kwalletcli -f "$FOLDER" -e "$ENTRY" -p "$PASSWORD"
    else
        echo "Empty/no password entered, skipping writing password to wallet and mount."
        exit 1
    fi
fi

sudo mount -t cifs -o "${OPTIONS}${OPTIONS:+,}username=$USERNAME,password=$PASSWORD" "$SHARE" "$MOUNT"

Note: using kwallet-query would be the better option since it comes bundled with KDE/kwallet and supports non-default wallets, but I wasn't able to make it store a password. There were no errors shown and no non-zero exit code, but the password wouldn't be written to the wallet.