RHEL 8 から RHEL 9: "Network configuration for unsupported device types detected" エラーでインプレースアップグレードが失敗する

Issue

• RHEL 8 から RHEL 9 へのインプレースアップグレードを実行すると、次のように leapp が 1 つの阻害要因を報告します。

  Risk Factor: high (inhibitor)
  Title: Network configuration for unsupported device types detected
  Summary: RHEL 9 does not support the legacy network-scripts package that was deprecated in RHEL 8 in favor of NetworkManager. Files for device types that are not supported by NetworkManager are present in the system. Files with the problematic configuration:
      - /etc/sysconfig/network-scripts/ifcfg-XXX