How to fix Cannot install update when not on AC power issue

lwk@qwfys:~$ fwupdmgr get-devices  XPS 15 9560 │ ├─System Firmware: │     Device ID:          a45df35ac0e948ee180fe216a5f703f32dda163f │     Summary:            UEFI ESRT device │     Current version:    1.23.1 │     Minimum Version:    1.23.1 │     Vendor:             Dell (DMI:Dell Inc.) │     Update State:       Success │     Update Error:       Cannot install update when not on AC power │     GUIDs:              34578c72-11dc-4378-bc7f-b643866f598c │                         230c8b18-8d9b-53ec-838b-6cfc0383493a │                         18a8f546-f58a-556b-ae29-00fc15163b7d │     Device Flags:       ? Internal device │                         ? Internal device │                         ? System requires external power source │                         ? Supported on remote server │                         ? Needs a reboot after installation │                         ? Device is usable for the duration of the update │                         ? Updatable │    └─THNSN5512GPUK NVMe TOSHIBA 512GB:       Device ID:          3743975ad7f64f8d6575a9ae49fb3a8856fe186f       Summary:            NVM Express solid state drive       Current version:    5KDA4103       Vendor:             Toshiba Corporation (NVME:0x1179)       Update Error:       Cannot install update when not on AC power       GUIDs:              a1aa7718-9375-5e24-9b93-5426989c82a0                           f68c10f1-7ffe-5d9d-aab4-9ffb60dae498                           bfe8d16e-b612-5f26-9526-0123dd679e7d                           a7e9412b-a3cf-5819-9029-105efad314f1                           b03f4f21-f1c3-5b21-bb57-c5096120e7da       Device Flags:       ? Internal device                           ? Internal device                           ? System requires external power source                           ? Needs a reboot after installation                           ? Device is usable for the duration of the update                           ? Updatable      lwk@qwfys:~$ 

这个问题的主要原因是计算机电源线没有插入。插入电源线后，再次检查，发现正常。

lwk@qwfys:~$ fwupdmgr get-devices  XPS 15 9560 │ ├─System Firmware: │     Device ID:          a45df35ac0e948ee180fe216a5f703f32dda163f │     Summary:            UEFI ESRT device │     Current version:    1.23.1 │     Minimum Version:    1.23.1 │     Vendor:             Dell (DMI:Dell Inc.) │     Update State:       Success │     GUIDs:              34578c72-11dc-4378-bc7f-b643866f598c │                         230c8b18-8d9b-53ec-838b-6cfc0383493a │                         18a8f546-f58a-556b-ae29-00fc15163b7d │     Device Flags:       ? Internal device │                         ? Internal device │                         ? Updatable │                         ? System requires external power source │                         ? Supported on remote server │                         ? Needs a reboot after installation │                         ? Device is usable for the duration of the update │    └─THNSN5512GPUK NVMe TOSHIBA 512GB:       Device ID:          3743975ad7f64f8d6575a9ae49fb3a8856fe186f       Summary:            NVM Express solid state drive       Current version:    5KDA4103       Vendor:             Toshiba Corporation (NVME:0x1179)       GUIDs:              a1aa7718-9375-5e24-9b93-5426989c82a0                           f68c10f1-7ffe-5d9d-aab4-9ffb60dae498                           bfe8d16e-b612-5f26-9526-0123dd679e7d                           a7e9412b-a3cf-5819-9029-105efad314f1                           b03f4f21-f1c3-5b21-bb57-c5096120e7da       Device Flags:       ? Internal device                           ? Internal device                           ? Updatable                           ? System requires external power source
                          • Needs a reboot after installation
                          • Device is usable for the duration of the update
    
lwk@qwfys:~$