unable to reload packages using synaptic package manager

When click on "Reload" button using synaptic package manager, the following error messages displayed.
it looks as the package name is changed.
The package name in the following path (http://de.archive.ubuntu.com/ubuntu/dists/xenial-updates/restricted/dep11/) is called "Components-i386.yml.gz" and when manually unzip the "Components-i386.yml.gz", there is another file named ""Components-i386.yml.gz.new". I think the name of the package is changed.

<================================Error Messages===================================>
synoptic
Could not download all repository indexes
The repository may no longer be available or could not be contacted because of network problems. If available an older version of the failed index will be used. Otherwise the repository will be ignored. Check your network connection and ensure the repository address in the preferences is correct.

Failed to fetch http://de.archive.ubuntu.com/ubuntu/dists/xenial-updates/restricted/dep11/Components-i386.yml Could not open file /var/lib/apt/lists/partial/de.archive.ubuntu.com_ubuntu_dists_xenial-updates_restricted_dep11_Components-i386.yml.gz - open (13: Permission denied) [IP: 141.30.62.24 80]Some index files failed to download. They have been ignored, or old ones used instead.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: synaptic 0.83
ProcVersionSignature: Ubuntu 4.15.0-47.50~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-47-generic i686
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: i386
CurrentDesktop: Unity
Date: Sat Apr 6 17:07:58 2019
InstallationDate: Installed on 2019-01-13 (82 days ago)
InstallationMedia: Ubuntu 16.04.5 LTS "Xenial Xerus" - Release i386 (20180731)
SourcePackage: synaptic
UpgradeStatus: No upgrade log present (probably fresh install)