wifi 可以正常工作。我关上了笔记本电脑。我打开了笔记本电脑。wifi 不再工作了，具体来说就是找不到 wifi。我尝试重新启动网络管理器、重新启动 PC，尝试了在网上找到的所有解决方案，但都没有用。
关于我的系统的所有信息都在这里https://pastebin.com/jNP35arP。这些信息是通过运行生成的
wget -N -t 5 -T 10 https://github.com/UbuntuForums/wireless-info/raw/master/wireless-info && chmod +x wireless-info && ./wireless-info
同时通过 USB 网络共享功能连接到 Android 手机。
的输出dmesg | grep 8821ce是：
[ 4.312082] 8821ce: loading out-of-tree module taints kernel.
[ 4.315335] 8821ce: module verification failed: signature and/or required key missing - tainting kernel
[ 4.322727] RTW: rtl8821ce v5.2.5_1.26055.20180108.1
[ 4.322729] RTW: rtl8821ce BT-Coex version = COEX20170310-1212
[ 4.323011] rtl8821ce 0000:02:00.0: enabling device (0000 -> 0003)
[ 4.349877] RTW: rtw_read_efuse_from_file /system/etc/wifi/wifi_efuse_8821ce.map is not readable
[ 4.358635] Modules linked in: snd_seq gpu_sched btusb ttm uvcvideo btrtl input_leds videobuf2_vmalloc snd_seq_device hp_wmi btbcm 8821ce(OE+) sparse_keymap serio_raw wmi_bmof drm_kms_helper videobuf2_memops btintel k10temp snd_timer videobuf2_v4l2 bluetooth drm videobuf2_common i2c_algo_bit videodev snd fb_sys_fops syscopyarea mc ecdh_generic sysfillrect cfg80211 sysimgblt ecc soundcore joydev hp_accel lis3lv02d input_polldev hp_wireless mac_hid sch_fq_codel parport_pc ppdev lp parport ip_tables x_tables autofs4 hid_generic i2c_amd_mp2_pci usbhid hid nvme psmouse i2c_piix4 ahci r8169 libahci realtek nvme_core wmi i2c_scmi video
[ 4.358775] ? _rtw_malloc+0x2d/0x2f [8821ce]
[ 4.358828] rtw_wiphy_register+0x26/0x53 [8821ce]
[ 4.358872] ? rtw_wiphy_register+0x26/0x53 [8821ce]
[ 4.358915] rtw_cfg80211_ndev_res_register+0x19/0x5b [8821ce]
[ 4.358956] rtw_os_ndev_register+0x116/0x196 [8821ce]
[ 4.358998] rtw_os_ndevs_register+0x9d/0x12f [8821ce]
[ 4.359039] rtw_os_ndevs_init+0x29/0x3f [8821ce]
[ 4.359079] rtw_drv_init+0x3e0/0xaa3 [8821ce]
[ 4.359136] rtw_drv_entry+0x78/0x1000 [8821ce]
[ 4.359224] WARNING: CPU: 5 PID: 390 at /var/lib/dkms/rtl8821ce/v5.2.5_1.26055.20180108.1/build/os_dep/linux/os_intfs.c:1514 rtw_os_ndev_register+0xbb/0x196 [8821ce]
[ 4.359224] Modules linked in: snd_seq gpu_sched btusb ttm uvcvideo btrtl input_leds videobuf2_vmalloc snd_seq_device hp_wmi btbcm 8821ce(OE+) sparse_keymap serio_raw wmi_bmof drm_kms_helper videobuf2_memops btintel k10temp snd_timer videobuf2_v4l2 bluetooth drm videobuf2_common i2c_algo_bit videodev snd fb_sys_fops syscopyarea mc ecdh_generic sysfillrect cfg80211 sysimgblt ecc soundcore joydev hp_accel lis3lv02d input_polldev hp_wireless mac_hid sch_fq_codel parport_pc ppdev lp parport ip_tables x_tables autofs4 hid_generic i2c_amd_mp2_pci usbhid hid nvme psmouse i2c_piix4 ahci r8169 libahci realtek nvme_core wmi i2c_scmi video
[ 4.359282] RIP: 0010:rtw_os_ndev_register+0xbb/0x196 [8821ce]
[ 4.359333] rtw_os_ndevs_register+0x9d/0x12f [8821ce]
[ 4.359373] rtw_os_ndevs_init+0x29/0x3f [8821ce]
[ 4.359413] rtw_drv_init+0x3e0/0xaa3 [8821ce]
[ 4.359462] rtw_drv_entry+0x78/0x1000 [8821ce]
[ 4.397495] WARNING: CPU: 5 PID: 390 at /var/lib/dkms/rtl8821ce/v5.2.5_1.26055.20180108.1/build/os_dep/linux/os_intfs.c:2748 rtw_os_ndevs_register+0xf6/0x12f [8821ce]
[ 4.397497] Modules linked in: snd_seq_midi_event aes_x86_64 crypto_simd cryptd glue_helper snd_rawmidi amd_iommu_v2 fjes(-) snd_seq gpu_sched btusb ttm uvcvideo btrtl input_leds videobuf2_vmalloc snd_seq_device hp_wmi btbcm 8821ce(OE+) sparse_keymap serio_raw wmi_bmof drm_kms_helper videobuf2_memops btintel k10temp snd_timer videobuf2_v4l2 bluetooth drm videobuf2_common i2c_algo_bit videodev snd fb_sys_fops syscopyarea mc ecdh_generic sysfillrect cfg80211 sysimgblt ecc soundcore joydev hp_accel lis3lv02d input_polldev hp_wireless mac_hid sch_fq_codel parport_pc ppdev lp parport ip_tables x_tables autofs4 hid_generic i2c_amd_mp2_pci usbhid hid nvme psmouse i2c_piix4 ahci r8169 libahci realtek nvme_core wmi i2c_scmi video
[ 4.397605] RIP: 0010:rtw_os_ndevs_register+0xf6/0x12f [8821ce]
[ 4.397679] rtw_os_ndevs_init+0x29/0x3f [8821ce]
[ 4.397733] rtw_drv_init+0x3e0/0xaa3 [8821ce]
[ 4.397813] rtw_drv_entry+0x78/0x1000 [8821ce]
答案1
经过很长时间，我在这个答案中找到了解决方案：https://askubuntu.com/a/762255/763097
启动时按下ESC，在 grub 中进入系统设置部分，禁用安全启动。
Wifi 已恢复