Tag: apt

Error encountered during `apt install` indicated that the file couldn’t be accessed by user `_apt`

Error encountered during apt install indicated that the file couldn't be accessed by user _apt

When installing package from local file (.deb file), following error might be occurred.

Processing triggers for dbus (1.14.0-2ubuntu3) ...
N: Download is performed unsandboxed as root as file 'full_path_of_deb_file_name' couldn't be accessed by user '_apt'. - pkgAcquire::Run (13: Permission denied)

Usually apt tries to run the process that fetches packages as a different user called _apt to increase security. That's no problem if it has to download packages from the internet. But if you tell it to install a .deb file that's already on your system, it needs to have permission to access that file by _apt user. Otherwise, above error will be shown.


Download performed unsandboxed

Detect and Fix Proxmox file integrity issue

Detect and Fix Proxmox file integrity issue

The files can be easily corrupted if the Proxmox OS is installed on an USB device.


Because Proxmox uses Debian system, run following command to detect corruption

# dpkg --verify
??5?????? c /etc/apt/sources.list.d/pve-enterprise.list
??5?????? c /etc/lvm/lvm.conf
??5?????? c /etc/issue

Above files can be ignored as reason below.

  • /etc/apt/sources.list.d/pve-enterprise.list: Not using enterprise repo
  • /etc/lvm/lvm.conf: LVM configuration file contains system specific info, such as UUIDs
  • /etc/issue: This file contains IP address of host


Find out the packages

# dpkg -S <list of file_name>

Reinstall the packages

apt --reinstall install <list of package_name>