[Bug 1715012] [NEW] Installing snapd can hide dpkg prompts and make it look like it's stuck

Andreas Hasenack andreas at canonical.com
Mon Sep 4 18:13:12 UTC 2017

Public bug reported:

>From the upstream report at https://github.com/CanonicalLtd/ubuntu-

I tried to enable livepatch on a trusty machine, but it got stuck:

ubuntu at 61-b1:~$ sudo ubuntu-advantage enable-livepatch <redacted>
Installing missing dependency snapd... 

Behind the scenes, what happened is that dpkg issued a prompt:

2228 pts/0    S+     0:00  |           \_ sudo ubuntu-advantage enable-livepatch redacted
2229 pts/0    S+     0:00  |               \_ /bin/sh -e /usr/bin/ubuntu-advantage enable-livepatch redacted
2236 pts/0    S+     0:01  |                   \_ apt-get install -y snapd
3269 pts/0    S+     0:00  |                       \_ /usr/bin/dpkg --status-fd 43 --configure liblzo2-2:amd64 libsystemd-journal0:amd64 linux-image-4.4.0-92-generic:amd64 linux-image-extra-4.4.0-92-generic:amd64 linux-image-generic-lts-xenial:amd64 linux-headers-4.4.0-92:all linux-headers-4.4.0-92-generic:amd64 linux-headers-generic-lts-xenial:amd64 linux-generic-lts-xenial:amd64 cgroup-lite:all squashfs-tools:amd64 systemd:amd64 snapd:amd64 thermald:amd64
3278 pts/0    S+     0:00  |                           \_ /usr/bin/perl /var/lib/dpkg/info/linux-image-4.4.0-92-generic.postinst configure 
3304 pts/0    S+     0:00  |                               \_ run-parts --verbose --exit-on-error --arg=4.4.0-92-generic --arg=/boot/vmlinuz-4.4.0-92-generic /etc/kernel/postinst.d
11905 pts/0    S+     0:00  |                                   \_ /usr/bin/perl -w /usr/share/debconf/frontend /usr/sbin/update-grub-legacy-ec2
11911 pts/0    S+     0:00  |                                       \_ /bin/bash /usr/sbin/update-grub-legacy-ec2
12312 pts/0    S+     0:00  |                                       |   \_ /bin/bash /usr/bin/ucf --debconf-ok --debconf-template grub/update_grub_changeprompt_threeway --three-way /tmp/filez4NBAU /var/run/grub/menu.lst
12362 pts/0    S+     0:00  |                                       \_ whiptail --backtitle Package configuration --title  --output-fd 11 --nocancel --default-item keep the local version currently installed --menu A new version of /boot/grub/menu.lst is available, but the version installed currently has been locally modified.  What would you like to do about menu.lst? 17 118 7 -- install the package maintainer's version  keep the local version currently installed  show the differences between the versions  show a side-by-side difference between the versions  show a 3-way difference between available versions  do a 3-way merge between available versions (experimental)  start a new shell to examine the situation 
Hitting ENTER at the stuck screen accepted whatever was the default choice and moved on.

Note that this can happen in any Ubuntu release, not just trusty.

** Affects: ubuntu-advantage-tools (Ubuntu)
     Importance: Medium
     Assignee: Andreas Hasenack (ahasenack)
         Status: In Progress

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  Installing snapd can hide dpkg prompts and make it look like it's

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