Hi, your issue is related to mixing stable and testing, which is not supported and causing your issue here. More below:
On Tue, 26 Feb 2019 10:54:15 +1100 "G. Branden Robinson" <g.branden.robin...@gmail.com> wrote: > Package: chromium > Version: 72.0.3626.96-1~deb9u1 > Severity: grave > Justification: renders package unusable > > I have been tracking testing for several months. > > This looks to me like a missing or insufficiently versioned Replaces > declaration, but I did not dig deeply into this except to check the BTS > to see if it had bitten anyone else. To my surprise, it looks like it > has not. > [...] > Get:1 http://ftp.au.debian.org/debian buster/main amd64 chromium-sandbox > amd64 72.0.3626.53-1 [137 kB] > Fetched 137 kB in 1s (179 kB/s) > Selecting previously unselected package chromium-sandbox. > (Reading database ... 351969 files and directories currently installed.) > Preparing to unpack .../chromium-sandbox_72.0.3626.53-1_amd64.deb ... > Unpacking chromium-sandbox (72.0.3626.53-1) ... > dpkg: error processing archive > /var/cache/apt/archives/chromium-sandbox_72.0.3626.53-1_amd64.deb (--unpack): This ^^^ here is not the current version in testing anymore. Current version is 72.0.3626.109-1. > trying to overwrite '/usr/lib/chromium/chrome-sandbox', which is also in > package chromium 72.0.3626.96-1~deb9u1 This ^^^ version here is the current package in stretch. You can easily solve your issue by cleanly upgrading to testing. You can also seek help in #debian on irc.oftc.net. I'm leaving this bug open however, as this issue could also happen during upgrade from stretch to buster. It's missing versioned dependencies. Regards, Lee