每次尝试安装时都会出现错误。我尝试清除并重新安装，但没有帮助。我还尝试更改权限，例如这篇文章建议。结果相同。
sudo apt install /home/privileged/Downloads/brave/vivaldi-stable_3.8.2259.42-1_amd64.deb
Reading package lists... Done
Building dependency tree
Reading state information... Done
Note, selecting 'vivaldi-stable' instead of '/home/privileged/Downloads/brave/vivaldi-stable_3.8.2259.42-1_amd64.deb'
Recommended packages:
adobe-flashplugin
The following NEW packages will be installed:
vivaldi-stable
0 upgraded, 1 newly installed, 0 to remove and 1 not upgraded.
Need to get 0 B/82.5 MB of archives.
After this operation, 282 MB of additional disk space will be used.
Get:1 /home/privileged/Downloads/brave/vivaldi-stable_3.8.2259.42-1_amd64.deb vivaldi-stable amd64 3.8.2259.42-1 [82.5 MB]
Selecting previously unselected package vivaldi-stable.
(Reading database ... 257032 files and directories currently installed.)
Preparing to unpack .../vivaldi-stable_3.8.2259.42-1_amd64.deb ...
Unpacking vivaldi-stable (3.8.2259.42-1) ...
Setting up vivaldi-stable (3.8.2259.42-1) ...
update-alternatives: using /usr/bin/vivaldi-stable to provide /usr/bin/vivaldi (vivaldi) in auto mode
Processing triggers for desktop-file-utils (0.23-4) ...
Processing triggers for mime-support (3.62) ...
Processing triggers for bamfdaemon (0.5.4-1) ...
Rebuilding /usr/share/applications/bamf-2.index...
N: Download is performed unsandboxed as root as file '/home/privileged/Downloads/brave/vivaldi-stable_3.8.2259.42-1_amd64.deb' couldn't be accessed by user '_apt'. - pkgAcquire::Run (13: Permission denied)
运行带有 xorg 和 xfce4 的 debian 10。
答案1
这似乎只是一条信息警告。来自Unix SE：apt get 或其他类似程序中的错误行前缀 w 是什么意思
N表示通知。通知是程序希望您注意的事项，但不是警告。典型的通知apt是N: There is 1 additional version. Please use the '-a' switch to see it。
您的具体错误信息
N：下载以 root 身份未沙盒化执行，因为文件 '/home/privileged/Downloads/brave/vivaldi-stable_3.8.2259.42-1_amd64.deb' 无法被用户 '_apt' 访问。- pkgAcquire::Run (13：权限被拒绝)
似乎表明您的下载已完成，root因此在提取和安装之前用于执行检查/下载的沙盒用户（_apt）apt无法访问它。
这实际上不是一个错误，而是一个通知，系统无法验证正在安装的软件包，只是让您知道发生了一些“正常”之外的事情。