ubuntu gnome 17.04 问题解决

**严重问题：系统有时卡死，彻底无响应 **
看kernel日志，错误信息以下：

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

看上去和swap有关系，17.04默认使用swap文件，非swap分区。
搜到的信息：https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1674838
** 解决方法（效果待观察）： **
修改fstab，改成使用swap分区
更新（2017.5.10）： 换用swap分区无效。看kernel日志，彷佛发生了死锁，有Intel api的字样，搜到下面的帖子：
ubuntu-15-10-and-16-04-keep-freezing-randomly
给出的解决方法为

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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如下问题经过 journalctl -b 查看启动日志中失败项

1. nvidia驱动问题：
   安装了nvidia-375, tested驱动，但启动日志里一堆失败：

[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（安装包的问题？）。用 nvidia-smi 查看状态也提示找不到 libnvidia-ml.so
手动解决方法：

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. 错误信息： Could not parse desktop file orca-autostart.desktop or it reference
   **缘由：**由于不用屏幕朗读，因此卸载了orca。
   解决方法：

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

3. 错误信息： spice-vdagent[1434]: Cannot access vdagent virtio channel /dev/virtio-ports/com.redhat.spice
   **缘由：**桌面机，非虚拟机
   解决方法：

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

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未理会的错误：

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]: 打开声音文件失败。
   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