从密钥环中清除已保存的凭据
# Open Seahorse to find and remove the specific stale entry
sudo apt install seahorse -y
seahorse
# Clear Kerberos ticket cache (safe — only affects Kerberos tickets)
kdestroy
In Seahorse (Passwords and Keys): Passwords → Login → search for the specific server/app you can't authenticate to → delete only that entry. Avoid deleting the whole keyring file (e.g. rm -rf ~/.local/share/keyrings/*.keyring) — it also stores unrelated saved passwords like Wi-Fi and other apps, and wiping it removes those too.