ubuntu gnome 17.04 問題解決

**嚴重問題：系統有時卡死，徹底無響應 **
看kernel日誌，錯誤信息以下：

kernel BUG at /build/linux-7LGLH_/linux-4.10.0/include/linux/swapops.h:129

看上去和swap有關係，17.04默認使用swap文件，非swap分區。
搜到的信息：https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1674838
** 解決方法（效果待觀察）： **
修改fstab，改成使用swap分區
更新（2017.5.10）： 換用swap分區無效。看kernel日誌，彷佛發生了死鎖，有Intel api的字樣，搜到下面的帖子：
ubuntu-15-10-and-16-04-keep-freezing-randomly
給出的解決方法爲

sudo vi /etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash intel_idle.max_cstate=1"
sudo update-grub
sudo reboot

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如下問題經過 journalctl -b 查看啓動日誌中失敗項

1. nvidia驅動問題：
   安裝了nvidia-375, tested驅動，但啓動日誌裏一堆失敗：

[Failed] Failed to start NVIDIA Persistence Daemon. See 'systemctl status nvidia-persistenced.service' for details.
nvidia-persistenced.service: Failed at step EXEC spawning /usr/bin/nvidia-persistenced: No such file
nvidia-persistenced[12507]: Failed to open libnvidia-cfg.so.1: libnvidia-cfg.so.1: cannot open shared object file: No such file

都是文件找不到（安裝包的問題？）。用 nvidia-smi 查看狀態也提示找不到 libnvidia-ml.so
手動解決方法：

sudo ln -s /usr/lib/nvidia-375/libnvidia-ml.so.1 /usr/lib/
sudo ln -s /usr/lib/nvidia-375/libnvidia-cfg.so.1 /usr/lib/
sudo ln -s /usr/lib/nvidia-375/bin/nvidia-persistenced /usr/bin

2. 錯誤信息： Could not parse desktop file orca-autostart.desktop or it reference
   **緣由：**由於不用屏幕朗讀，因此卸載了orca。
   解決方法：

sudo rm /usr/share/gdm/greeter/autostart/orca-autostart.desktop

3. 錯誤信息： spice-vdagent[1434]: Cannot access vdagent virtio channel /dev/virtio-ports/com.redhat.spice
   **緣由：**桌面機，非虛擬機
   解決方法：

sudo vim /usr/share/gdm/greeter/autostart/spice-vdagent.desktop
添加：X-GNOME-Autostart-enabled=false

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未理會的錯誤：

1. Apparmor Init Failed, Exit Code 123
   sudo apt install apparmor-easyprof-ubuntu
2. AppArmor parser error for /etc/apparmor.d/usr.bin.firefox. line 23: Could not open 'abstractions/ubuntu-browsers.d/firefox'
   sudo systemctl status -l apparmor.service
3. nvidia: loading out-of-tree module taints kernel.
4. iwlwifi 0000:03:00.0: can't disable ASPM; OS doesn't have ASPM control
5. failed to open statefile /var/run/network/ifstate:
6. [pulseaudio] backend-ofono.c: Failed to register as a handsfree audio agent with ofono: org.freedesktop.
   dbus-send --system --type=method_call --print-reply --dest=org.ofono / org.freedesktop.DBus.Introspectable.Introspect
7. pulseaudio.desktop[1936]: 打開聲音文件失敗。
   gnome-session[1711]: gnome-session-binary[1711]: WARNING: App 'pulseaudio.desktop' exited with code 1
8. gsd-housekeepin[1950]: Failed to enumerate children of /tmp/systemd-private