删除snap,snap会自动更新,严重占带宽 
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snap list
 sudo snap remove gtk-common-themes
 ...
 sudo apt-get remove snapd
 
 df -h | grep snap
 sudo systemctl stop snap-core-6350.mount
 sudo systemctl disable snap-core-6350.mount 
 
ssh 保持连接 
服务端
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ClientAliveInterval 60
 ClientAliveCountMax 1 
 
SSH Server 每 60 秒就会自动发送一个信号给 Client,客户端没有回应数超过 ClientAliveCountMax 时,才会断开连接。
客户端
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TCPKeepAlive yes
 ServerAliveInterval 300 
 
前一个参数是说要保持连接,后一个参数表示每过5分钟发一个数据包到服务器
命令行进行设定即:
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ssh -o TCPKeepAlive=yes -o ServerAliveInterval=300 root@1.2.3.4 
 
dns 命令 
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sudo apt-get install pppconfig
 /etc/init.d/dns-clean
 
 systemctl stop systemd-resolved
 systemctl start systemd-resolved
 
 systemd-resolve --statistics
 systemd-resolve --status
 systemd-resolve --flush-caches 
 
代理设置 
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# cat /etc/apt/apt.conf
 Acquire::https::Proxy "http://proxy.proxy.com:8080";
 # err? http_proxy=http://proxy.proxy.com:8080
 # err? https_proxy=http://proxy.proxy.com:8080
 
 # cat /etc/environment
 http_proxy=http://proxy.proxy.com:8080
 https_proxy=http://proxy.proxy.com:8080
 no_proxy=localhost,127.0.0.0/8,::1,*.pp.com,*.oa.com
 
 # cat /etc/systemd/system/docker.service.d/http-proxy.conf
 [Service]
 Environment="HTTP_PROXY=http://proxy.proxy.com:8080" 
 
amdgpu.dc 
VGA,DIV-D接口 4.15.0 以后内核黑屏,需要设置amdgpu.dc=0
HDMI,DP接口支持音频,需要设置amdgpu.dc=1
注释掉下面这行将会显示引导菜单 
 
设定默认启动项 /etc/default/grub 
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# 用数字
 GRUB_DEFAULT=0
 
 # 最近启动
 GRUB_DEFAULT=saved
 GRUB_SAVEDEFAULT=true
 
 # 指定内核
 GRUB_DEFAULT="gnulinux-advanced-999d2fc9-3d7b-4654-a25c-4f5d4472a23b>gnulinux-4.15.0-55-generic-advanced-999d2fc9-3d7b-4654-a25c-4f5d4472a23b" 
 
Warning: Please don’t use old title Ubuntu, with Linux 4.15.0-55-generic' for GRUB_DEFAULT, useAdvanced options for Ubuntu>Ubuntu, with Linux 4.15.0-55-generic' (for versions before 2.00) or `gnulinux-advanced-999d2fc9-3d7b-4654-a25c-4f5d4472a23b>gnulinux-4.15.0-55-generic-advanced-999d2fc9-3d7b-4654-a25c-4f5d4472a23b' (for 2.00 or later)
卸载amazon 
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# 16.04
 sudo apt-get remove unity-webapps-common
 
 # 18.04
 sudo apt-get remove ubuntu-web-launchers 
 
新立得 
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sudo apt-get install synaptic 
 
禁用apport 
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/etc/default/apport
 enabled=0 
 
禁用service 
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# 禁用
 sudo systemctl disable apport.service
 
 # 如果这不起作用,那么您需要屏蔽该服务
 systemctl mask apport.service
 
 # 重新启用
 systemctl unmask apport.service # if you masked it
 sudo systemctl enable apport.service 
 
中文输入法 
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sudo apt-get install ibus-pinyin
 # 选择全拼模式,同时勾选“简拼”, 然后运行
 sudo ibus restart 
 
温度 
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sudo apt-get install lm-sensors hddtemp
 sudo sensors-detect
 sensors
 sudo apt-get install psensor 
 
查看SSD状态 
https://www.cnblogs.com/fiberhome/p/8275961.html 
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hdparm -t --direct /dev/sda
 
 smartctl -i /dev/sda
 
 sudo smartctl -data -A /dev/sda
 sudo smartctl -A /dev/sda
 
 # 233一行的值就是寿命,默认为100,当小于10的时候就要非常注意了。 
 
个人桌面系统可以加 noatime 
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vim /etc/fstab
 增加 noatime
 
 stat /etc/fstab 
 
nvme硬盘温度 
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sudo apt-get install nvme-cli
 sudo nvme list
 
 sudo nvme smart-log /dev/nvme0
 sudo watch -n 1 nvme smart-log /dev/nvme0
 
 sudo nvme smart-log /dev/nvme0 | grep "^temperature" 
 
SSD 
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Aggressive LPM Support功能是SATA口的节能电源管理,开启会导致SSD掉盘,不认盘,掉速等问题。
 
 解决方法:
 
 到BIOS中找到Aggressive LPM Support并关闭。 
 
18.04 unity 
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sudo apt install ubuntu-unity-desktop
 select lightdm
 
 # 恢复gnome
 sudo apt purge ubuntu-unity-desktop
 sudo dpkg-reconfigure gdm3 
 
18.04 用synergy1.6.2 
https://packages.ubuntu.com/xenial/libcrypto++9v5 
https://packages.ubuntu.com/xenial/synergy 
synergy_1.6.2-0ubuntu2_amd64.deb 
libcrypto++9v5_5.6.1-9ubuntu0.1_amd64.deb