some tricky operate or configure for ubuntu.
Kernel Manage
upgrade kernel to HWE(Hardware Enablement) kernel
sudo apt install linux-generic-hwe-20.04
prevent kernel upgrade
ran command :
uname -r
to find Kernel Version. It gave output:
5.15.0-52-generic
Then I ran command:
sudo apt-mark hold 5.15.0-52-generic
Disable auto update
Edit the configuration file for the package management system by running the following command:
vim /etc/apt/apt.conf.d/20auto-upgrades
This file controls the behavior of automatic updates. Comment out the lines that enable automatic updates by adding a // at the beginning of each line or by removing the lines completely.
//APT::Periodic::Update-Package-Lists "0";
//APT::Periodic::Download-Upgradeable-Packages "0";
//APT::Periodic::AutocleanInterval "0";
//APT::Periodic::Unattended-Upgrade "0";
Restart the unattended-upgrades service to apply the changes by running the following command:
sudo systemctl restart unattended-upgrades
all done!
Disable or Enable Animations
sudo apt install gnome-tweaks
Open Tweaks in Gnome GUI Desktop, In General –> Animations –> Off.
pre-installation 脚本 子进程返回错误状态 1
首先，删除先前的安装尝试。使用以下命令删除 Packet Tracer
sudo apt-get remove packettracer
用以下命令解压软件包（将 /path/to 替换为软件包的实际路径）：
mkdir packettracer
dpkg-deb -R /path/to/Packet_Tracer821_amd64_signed.deb packettracer
打开 DEBIAN/preinst 文件进行编辑, 在文件的开头添加 exit 0，保存并关闭文件。：
cd packettracer
sudo vim DEBIAN/preinst
like below:
#!/bin/sh -e
exit 0
# Source debconf library.
. /usr/share/debconf/confmodule
返回到 packettracer 目录，并使用以下命令重新打包软件包：
cd ..
dpkg-deb -b packettracer packettracer_modified.deb
现在，使用以下命令重新安装修改后的软件包：
sudo dpkg -i packettracer_modified.deb