Hello. I'm using debian sid (from debian-installer daily build less than six months old) and I encountered a very similar problem. I am using libvirt/qemu/kvm.
I was running `sudo apt-get dist-upgrade` in the guest and `sudo apt-get install apt-cacher-ng` on the host. Below my signature are some simple terminal logs. I'll have to wait an hour and a half to reboot the host machine. When I reboot the machine, what information should I collect? I know how to run reportbug without arguments. What else? Cheers, --Dave host: sebboh@truth:~$ sudo apt-get install apt-cacher-ng [sudo] password for sebboh: Reading package lists... Done Building dependency tree Reading state information... Done Suggested packages: doc-base avahi-daemon The following NEW packages will be installed: apt-cacher-ng 0 upgraded, 1 newly installed, 0 to remove and 652 not upgraded. Need to get 525 kB of archives. After this operation, 1,435 kB of additional disk space will be used. Get:1 http://debian.uchicago.edu/debian sid/main amd64 apt-cacher-ng amd64 3.1-1 [525 kB] Fetched 525 kB in 0s (708 kB/s) Preconfiguring packages ... Selecting previously unselected package apt-cacher-ng. (Reading database ... 94471 files and directories currently installed.) Preparing to unpack .../apt-cacher-ng_3.1-1_amd64.deb ... Unpacking apt-cacher-ng (3.1-1) ... Processing triggers for systemd (236-1) ... Failed to reload daemon: Connection reset by peer Connection to truth closed. guest: sebboh@tiny:~$ sudo apt-get upgrade; sudo apt-get dist-upgrade [sudo] password for sebboh: Reading package lists... Done Building dependency tree Reading state information... Done Calculating upgrade... Done The following packages have been kept back: linux-image-amd64 The following packages will be upgraded: bsdutils fdisk gcc-8-base libapparmor1 libblkid1 libcryptsetup12 libfdisk1 libgcc1 libgpg-error0 libmount1 libnewt0.52 libpam-systemd libsmartcols1 libstdc++6 libsystemd0 libudev1 libuuid1 libx11-6 libx11-data mount systemd systemd-sysv udev util-linux util-linux-locales whiptail 26 upgraded, 0 newly installed, 0 to remove and 1 not upgraded. Need to get 10.3 MB of archives. After this operation, 32.8 kB of additional disk space will be used. Do you want to continue? [Y/n] Get:1 http://debian.gtisc.gatech.edu/debian sid/main amd64 bsdutils amd64 1:2.31.1-0.5 [117 kB] Get:2 http://debian.gtisc.gatech.edu/debian sid/main amd64 libuuid1 amd64 2.31.1-0.5 [76.8 kB] Get:3 http://debian.gtisc.gatech.edu/debian sid/main amd64 libblkid1 amd64 2.31.1-0.5 [183 kB] Get:4 http://debian.gtisc.gatech.edu/debian sid/main amd64 libfdisk1 amd64 2.31.1-0.5 [224 kB] Get:5 http://debian.gtisc.gatech.edu/debian sid/main amd64 libmount1 amd64 2.31.1-0.5 [196 kB] Get:6 http://debian.gtisc.gatech.edu/debian sid/main amd64 libsmartcols1 amd64 2.31.1-0.5 [141 kB] Get:7 http://debian.gtisc.gatech.edu/debian sid/main amd64 fdisk amd64 2.31.1-0.5 [166 kB] Get:8 http://debian.gtisc.gatech.edu/debian sid/main amd64 util-linux amd64 2.31.1-0.5 [957 kB] Get:9 http://debian.gtisc.gatech.edu/debian sid/main amd64 systemd-sysv amd64 238-3 [87.4 kB] Get:10 http://debian.gtisc.gatech.edu/debian sid/main amd64 libpam-systemd amd64 238-3 [186 kB] Get:11 http://debian.gtisc.gatech.edu/debian sid/main amd64 libsystemd0 amd64 238-3 [284 kB] Get:12 http://debian.gtisc.gatech.edu/debian sid/main amd64 systemd amd64 238-3 [3,058 kB] Get:13 http://debian.gtisc.gatech.edu/debian sid/main amd64 udev amd64 238-3 [1,183 kB] Get:14 http://debian.gtisc.gatech.edu/debian sid/main amd64 libudev1 amd64 238-3 [129 kB] Get:15 http://debian.gtisc.gatech.edu/debian sid/main amd64 libapparmor1 amd64 2.12-4 [85.0 kB] Get:16 http://debian.gtisc.gatech.edu/debian sid/main amd64 libgpg-error0 amd64 1.28-2 [126 kB] Get:17 http://debian.gtisc.gatech.edu/debian sid/main amd64 libcryptsetup12 amd64 2:2.0.2-1 [170 kB] Get:18 http://debian.gtisc.gatech.edu/debian sid/main amd64 mount amd64 2.31.1-0.5 [166 kB] Get:19 http://debian.gtisc.gatech.edu/debian sid/main amd64 gcc-8-base amd64 8-20180321-1 [183 kB] Get:20 http://debian.gtisc.gatech.edu/debian sid/main amd64 libstdc++6 amd64 8-20180321-1 [396 kB] Get:21 http://debian.gtisc.gatech.edu/debian sid/main amd64 libgcc1 amd64 1:8-20180321-1 [40.8 kB] Get:22 http://debian.gtisc.gatech.edu/debian sid/main amd64 libnewt0.52 amd64 0.52.20-4 [72.8 kB] Get:23 http://debian.gtisc.gatech.edu/debian sid/main amd64 whiptail amd64 0.52.20-4 [39.2 kB] Get:24 http://debian.gtisc.gatech.edu/debian sid/main amd64 libx11-data all 2:1.6.5-1 [292 kB] Get:25 http://debian.gtisc.gatech.edu/debian sid/main amd64 libx11-6 amd64 2:1.6.5-1 [749 kB] Get:26 http://debian.gtisc.gatech.edu/debian sid/main amd64 util-linux-locales all 2.31.1-0.5 [1,040 kB] Fetched 10.3 MB in 13s (789 kB/s) (Reading database ... 19372 files and directories currently installed.) Preparing to unpack .../bsdutils_1%3a2.31.1-0.5_amd64.deb ... Unpacking bsdutils (1:2.31.1-0.5) over (1:2.31.1-0.4) ... Setting up bsdutils (1:2.31.1-0.5) ... (Reading database ... 19372 files and directories currently installed.) Preparing to unpack .../libuuid1_2.31.1-0.5_amd64.deb ... Unpacking libuuid1:amd64 (2.31.1-0.5) over (2.31.1-0.4) ... Setting up libuuid1:amd64 (2.31.1-0.5) ... (Reading database ... 19372 files and directories currently installed.) Preparing to unpack .../libblkid1_2.31.1-0.5_amd64.deb ... Unpacking libblkid1:amd64 (2.31.1-0.5) over (2.31.1-0.4) ... Setting up libblkid1:amd64 (2.31.1-0.5) ... (Reading database ... 19372 files and directories currently installed.) Preparing to unpack .../libfdisk1_2.31.1-0.5_amd64.deb ... Unpacking libfdisk1:amd64 (2.31.1-0.5) over (2.31.1-0.4) ... Setting up libfdisk1:amd64 (2.31.1-0.5) ... (Reading database ... 19372 files and directories currently installed.) Preparing to unpack .../libmount1_2.31.1-0.5_amd64.deb ... Unpacking libmount1:amd64 (2.31.1-0.5) over (2.31.1-0.4) ... Setting up libmount1:amd64 (2.31.1-0.5) ... (Reading database ... 19372 files and directories currently installed.) Preparing to unpack .../libsmartcols1_2.31.1-0.5_amd64.deb ... Unpacking libsmartcols1:amd64 (2.31.1-0.5) over (2.31.1-0.4) ... Setting up libsmartcols1:amd64 (2.31.1-0.5) ... (Reading database ... 19372 files and directories currently installed.) Preparing to unpack .../fdisk_2.31.1-0.5_amd64.deb ... Unpacking fdisk (2.31.1-0.5) over (2.31.1-0.4) ... Connection to tiny closed. ...In both cases, I closed the ssh session manually with ~. .