关于ArchLinux软件降级的问题

由于Clion中,调试所用gdb版本要求最新到v11.1,所以只能对gdb进行降级,方法如下

你需要添加非官方的 archlinuxfr 仓库

sudo vim /etc/pacman.conf

添加如下行:

[archlinuxfr]
SigLevel = Never
Server = http://repo.archlinux.fr/$arch

更新仓库

sudo pacman -Syyy

安装downgrade

sudo pacman -S downgrade

对gdb降级

sudo downgrade gdb gdb-common

选择你要降级的版本,回车

sudo vim /etc/pacman.conf
#添加下面两行
IgnorePkg = gdb
IgnorePkg = gdb-common

关于蓝牙服务无法启动的问题

在安装了bluez和bluez-utils,蓝牙服务仍然无法开启,错误日志如下:

# journalctl -xeu bluetooth.service
Mar 18 13:04:24 overflow systemd[1]: Failed to start Bluetooth service.
░░ Subject: A start job for unit bluetooth.service has failed
░░ Defined-By: systemd
░░ Support: https://lists.freedesktop.org/mailman/listinfo/systemd-devel
░░ 
░░ A start job for unit bluetooth.service has finished with a failure.
░░ 
░░ The job identifier is 2813 and the job result is failed.
Mar 18 13:12:36 overflow systemd[1]: Starting Bluetooth service...
░░ Subject: A start job for unit bluetooth.service has begun execution
░░ Defined-By: systemd
░░ Support: https://lists.freedesktop.org/mailman/listinfo/systemd-devel
░░ 
░░ A start job for unit bluetooth.service has begun execution.
░░ 
░░ The job identifier is 2919.
Mar 18 13:12:36 overflow systemd[5708]: bluetooth.service: Failed to set up mount namespacing: /run/systemd/unit-root/var/lib/bluetooth: No such file or dir>
Mar 18 13:12:36 overflow systemd[5708]: bluetooth.service: Failed at step NAMESPACE spawning /usr/lib/bluetooth/bluetoothd: No such file or directory

异常产生原因: bluez版本过新

解决办法:降级bluez

sudo downgrade bluez

ArchLinux挂载vhd

需要安装以下三个工具

yay -S hivex
yay -S perl-sys-virt
yay -S libguestfs

运行guestmount

guestmount --add your_vhd_file.vhd --ro /mnt/vhd/ -m /dev/sda

• --add选项用于您要访问的vhd文件
• --ro设置为只读，或者您可以--rw用于读/写
• /mnt/vhd您要挂载的路径
• -m /dev/sda 指定要挂载的.vhd文件中的哪个分区。