W: Can't drop privileges for downloading as file '/var/cache/apt/archives/partial/libarchive13_3.2.1-2~ubuntu16.04.1_i386.deb' couldn't be accessed by user '_apt'. - pkgAcquire::Run (13: Permission denied) Reproducible: Always Steps to Reproduce: 1.click update and see liber 2. 3. Actual Results: W: Can't drop privileges for downloading as file '/var/cache/apt/archives/partial/libarchive13_3.2.1-2~ubuntu16.04.1_i386.deb' couldn't be accessed by user '_apt'. - pkgAcquire::Run (13: Permission denied) Expected Results: No issues updates! please fix. still ongoing wished no problem
Please read bug 370424 comment #1.