将最新的 18.04 更新应用到我的 Dell Precision 5520 后，蓝牙完全消失了。
这种情况之前发生过一次，在下次更新后就解决了。我尝试过重启，希望这只是暂时的，但没有成功。
这是上次启动时的完整 dmesg 日志。有与 USB 相关的错误，但我不知道它们有何关联。
dmesg 日志：https://pastebin.com/HC6sBa72
这些是今天早上应用的更新。其中似乎没有任何内容与蓝牙或无线直接相关。
Start-Date: 2018-10-28 09:36:52
Commandline: aptdaemon role='role-commit-packages' sender=':1.365'
Install: linux-headers-4.15.0-38-generic:amd64 (4.15.0-38.41, automatic), linux-modules-extra-4.15.0-38-generic:amd64 (4.15.0-38.41, automatic), linux-modules-4.15.0-38-generic:amd64 (4.15.0-38.41, automatic), linux-headers-4.15.0-38:amd64 (4.15.0-38.41, automatic), linux-image-4.15.0-38-generic:amd64 (4.15.0-38.41, automatic)
Upgrade: libpackagekit-glib2-18:amd64 (1.1.9-1ubuntu2.18.04.1, 1.1.9-1ubuntu2.18.04.3), update-manager-core:amd64 (1:18.04.11.5, 1:18.04.11.6), linux-headers-generic:amd64 (4.15.0.36.38, 4.15.0.38.40), friendly-recovery:amd64 (0.2.38, 0.2.38ubuntu1), linux-libc-dev:amd64 (4.15.0-36.39, 4.15.0-38.41), libapt-inst2.0:amd64 (1.6.3ubuntu0.1, 1.6.6), grub-common:amd64 (2.02-2ubuntu8.6, 2.02-2ubuntu8.7), linux-image-generic:amd64 (4.15.0.36.38, 4.15.0.38.40), apt:amd64 (1.6.3ubuntu0.1, 1.6.6), update-manager:amd64 (1:18.04.11.5, 1:18.04.11.6), google-chrome-stable:amd64 (70.0.3538.67-1, 70.0.3538.77-1), grub2-common:amd64 (2.02-2ubuntu8.6, 2.02-2ubuntu8.7), gdm3:amd64 (3.28.3-0ubuntu18.04.1, 3.28.3-0ubuntu18.04.3), libapt-pkg5.0:amd64 (1.6.3ubuntu0.1, 1.6.6), packagekit-tools:amd64 (1.1.9-1ubuntu2.18.04.1, 1.1.9-1ubuntu2.18.04.3), grub-pc:amd64 (2.02-2ubuntu8.6, 2.02-2ubuntu8.7), linux-signed-generic:amd64 (4.15.0.36.38, 4.15.0.38.40), gir1.2-gdm-1.0:amd64 (3.28.3-0ubuntu18.04.1, 3.28.3-0ubuntu18.04.3), grub-pc-bin:amd64 (2.02-2ubuntu8.6, 2.02-2ubuntu8.7), libxnvctrl0:amd64 (410.66-0ubuntu0~gpu18.04.1, 410.73-0ubuntu0~gpu18.04.1), libgdm1:amd64 (3.28.3-0ubuntu18.04.1, 3.28.3-0ubuntu18.04.3), grub-efi-amd64-bin:amd64 (2.02-2ubuntu8.6, 2.02-2ubuntu8.7), man-db:amd64 (2.8.3-2, 2.8.3-2ubuntu0.1), python3-update-manager:amd64 (1:18.04.11.5, 1:18.04.11.6), packagekit:amd64 (1.1.9-1ubuntu2.18.04.1, 1.1.9-1ubuntu2.18.04.3), apt-utils:amd64 (1.6.3ubuntu0.1, 1.6.6), light-themes:amd64 (16.10+18.04.20180421.1-0ubuntu1, 16.10+18.04.20181005-0ubuntu1), ubuntu-artwork:amd64 (1:16.10+18.04.20180421.1-0ubuntu1, 1:16.10+18.04.20181005-0ubuntu1), grub-efi-amd64-signed:amd64 (1.93.7+2.02-2ubuntu8.6, 1.93.8+2.02-2ubuntu8.7), gir1.2-packagekitglib-1.0:amd64 (1.1.9-1ubuntu2.18.04.1, 1.1.9-1ubuntu2.18.04.3), apt-transport-https:amd64 (1.6.3ubuntu0.1, 1.6.6), gstreamer1.0-packagekit:amd64 (1.1.9-1ubuntu2.18.04.1, 1.1.9-1ubuntu2.18.04.3), linux-generic:amd64 (4.15.0.36.38, 4.15.0.38.40), ubuntu-mono:amd64 (16.10+18.04.20180421.1-0ubuntu1, 16.10+18.04.20181005-0ubuntu1), nvidia-settings:amd64 (410.66-0ubuntu0~gpu18.04.1, 410.73-0ubuntu0~gpu18.04.1)
End-Date: 2018-10-28 09:38:34
我很想自己诊断一下，但技能不够深厚，不知道该做什么或去哪里找。任何想法或指导都将不胜感激