Mint 19.2升级后若干问题

August 7, 2019

Mint 19.2基于ubuntu 18.04，所以bug肯定是继承了的。

备注一下已知问题和暂时解决办法

1. 使用vpn后dns解析异常，表现为一会儿使用本地isp的一会儿使用vpn推送的。
 - https://github.com/systemd/systemd/issues/6076
 - https://github.com/systemd/systemd/issues/10830
 - https://github.com/systemd/systemd/issues/7182
 我的临时解决办法简单粗暴，禁用systemd的解析服务，改用NetworkManager的， [参考这里](https://www.unixgr.com/disabling-systemd-resolvd-service-on-ubuntu-systems/ "参考这里")
 ```
 sudo systemctl disable systemd-resolved.service
 sudo service systemd-resolved stop
 ```
 编辑`/etc/NetworkManager/NetworkManager.conf`，添加
 ```
 [main]
dns=default
 ```
清理原有链接并重启NetworkManager
```
sudo rm /etc/resolv.conf
sudo service network-manager restart
```
2. fcitx不能自动启动，貌似和dbus有关：

解决办法：添加到Startup Applications里面去

fcitx无法更改默认输入法：
```
rm -rf ~/.config/fcitx/data/layout_override
```
3. xsessions里报找不到smartcard driver
```
[cinnamon-settings-daemon-smartcard] Failed to start: no suitable smartcard driver could be found
[cinnamon-settings-daemon-smartcard] Failed to start: no suitable smartcard driver could be found
```
解决办法：
修改` /etc/xdg/autostart/cinnamon-settings-daemon-smartcard.desktop`禁用自动启动
```
X-GNOME-Autostart-enabled=false
X-GNOME-Autostart-Phase=false
X-GNOME-Autostart-Notify=false
X-GNOME-AutoRestart=false
```
4. nm-applet异常，扫描wifi变更时内存泄漏
```
(nm-applet:12782): Gtk-WARNING **: 14:26:55.405: Can't set a parent on widget which has a parent
```
https://gitlab.gnome.org/GNOME/network-manager-applet/issues/34

暂时无解。

5. /etc/network/if-up.d/下的脚本执行异常,应改为使用 NetworkManager dispatch events的方式执行。

解决办法：放在 /etc/NetworkManager/dispatcher.d/

6. 内核报错
```
[Firmware Bug]: TSC_DEADLINE disabled due to Errata; please update microcode to version: 0xb2 (or later)
```
 https://stackoverflow.com/questions/48036877/debian-firmware-bug-tsc-deadline-disabled-due-to-errata
 解决办法：
```
sudo apt install intel-microcode
```
7. PAM unable to dlopen(pam_kwallet5.so): /lib/security/pam_kwallet5.so: cannot open shared object file: No such file or directory
https://forums.linuxmint.com/viewtopic.php?t=286950
 解决办法：编辑
 ```
 /etc/pam.d/lightdm 
/etc/pam.d/lightdm-greeter
 ```
 注释掉对应两行即可
 ```
 #auth optional pam_kwallet.so
#auth optional pam_kwallet5.so
#session optional pam_kwallet.so auto_start
#session optional pam_kwallet5.so auto_start 
 ```
8. psmouse serio2: elantech: failed to query capabilities.
 https://www.linuxquestions.org/questions/linux-hardware-18/touchpad-recognized-as-ps-2-elantech-touchpad-multitouch-not-working-on-latest-linux-distros-mint-ubuntu-fedora-manjaro-4175608561/
 解决办法: 编辑`/etc/default/grub`重新生产启动镜像:
 ```
 GRUB_CMDLINE_LINUX="i8042.nomux=1 i8042.reset"
 ```
 https://unix.stackexchange.com/questions/28736/what-does-the-i8042-nomux-1-kernel-option-do-during-booting-of-ubuntu

9. pulseaudio 启动失败
```
[pulseaudio] backend-ofono.c: Failed to register as a handsfree audio agent with ofono: org.freedesktop.DBus.Error.ServiceUnknown: The name org.ofono was not provided by any .service files
```
解决办法
```
apt-get install ofono
```

10. rtl8821ae 无线驱动
```
sudo apt-get install linux-headers-generic build-essential git 
git clone http://github.com/lwfinger/rtlwifi_new.git
cd rtlwifi_new
make
sudo make install
#When your kernel changes, then you need to do the following:
cd ~/rtlwifi_new
git pull
make
sudo make install
```
多点出触摸和手势
- https://howchoo.com/g/mdy0ngziogm/the-perfect-almost-touchpad-settings-on-linux-2
- https://github.com/p2rkw/xf86-input-mtrack

联想air系列安装ubuntu参考资料：
- https://askubuntu.com/questions/367963/ubuntu-on-lenovo-yoga-2-pro
- https://github.com/lwfinger/rtlwifi_new
- https://askubuntu.com/questions/872313/wireless-issues-on-16-04-with-rtl8821ae-asus-e202s
- https://medium.com/@elmaxx/rtl8821ae-wifi-drivers-in-ubuntu-16-04-4c1286524afa

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