There is a similar situation where apt-get wants to remove packages when
strict dependencies (equal version number) cannot be met. For example
dovecot-core/dovecot-pop3d/dovecot-imapd.
After installing Ubuntu 16.04.3 LTS from the ISO, install the 3 packages
from the release pocket:
$ sudo apt install dovecot-imapd=1:2.2.22-1ubuntu2 \
dovecot-core=1:2.2.22-1ubuntu2 \
dovecot-pop3d=1:2.2.22-1ubuntu2
USN-3587-1 [1] wants dovecot-core to be upgraded to 1:2.2.22-1ubuntu2.7
Trying to upgrade dovecot-core to 1:2.2.22-1ubuntu2.7 will want to
remove dovecot-imapd and dovecot-pop3d:
$ sudo apt-get install --dry-run dovecot-core=1:2.2.22-1ubuntu2.7
Reading package lists... Done
Building dependency tree
Reading state information... Done
Suggested packages:
ntp dovecot-gssapi dovecot-sieve dovecot-pgsql dovecot-mysql dovecot-sqlite
dovecot-ldap dovecot-imapd dovecot-pop3d dovecot-lmtpd dovecot-managesieved
dovecot-solr
The following packages will be REMOVED:
dovecot-imapd dovecot-pop3d
The following packages will be upgraded:
dovecot-core
1 upgraded, 0 newly installed, 2 to remove and 171 not upgraded.
Remv dovecot-imapd [1:2.2.22-1ubuntu2]
Remv dovecot-pop3d [1:2.2.22-1ubuntu2]
Inst dovecot-core [1:2.2.22-1ubuntu2] (1:2.2.22-1ubuntu2.7
Ubuntu:16.04/xenial-security [amd64])
Conf dovecot-core (1:2.2.22-1ubuntu2.7 Ubuntu:16.04/xenial-security [amd64])
Why? The only package that is *required* to be upgraded (because the USN
specifies it, and because we currently treat USN package specs as binary
packages), is dovecot-core. Apt's (simple) dependency solver figures it can
upgrade that, but in doing so it breaks dovecot-imapd and dovecot-pop3d which
need removing as a consequence. The workaround is to specify all 3 packages:
$ sudo apt-get install --dry-run dovecot-core=1:2.2.22-1ubuntu2.7 \
dovecot-imapd=1:2.2.22-1ubuntu2.7 \
dovecot-pop3d=1:2.2.22-1ubuntu2.7
Reading package lists... Done
Building dependency tree
Reading state information... Done
Suggested packages:
ntp dovecot-gssapi dovecot-sieve dovecot-pgsql dovecot-mysql dovecot-sqlite
dovecot-ldap dovecot-lmtpd dovecot-managesieved dovecot-solr
The following packages will be upgraded:
dovecot-core dovecot-imapd dovecot-pop3d
3 upgraded, 0 newly installed, 0 to remove and 171 not upgraded.
Inst dovecot-pop3d [1:2.2.22-1ubuntu2] (1:2.2.22-1ubuntu2.7
Ubuntu:16.04/xenial-security [amd64]) []
Inst dovecot-imapd [1:2.2.22-1ubuntu2] (1:2.2.22-1ubuntu2.7
Ubuntu:16.04/xenial-security [amd64]) []
Inst dovecot-core [1:2.2.22-1ubuntu2] (1:2.2.22-1ubuntu2.7
Ubuntu:16.04/xenial-security [amd64])
Conf dovecot-core (1:2.2.22-1ubuntu2.7 Ubuntu:16.04/xenial-security [amd64])
Conf dovecot-pop3d (1:2.2.22-1ubuntu2.7 Ubuntu:16.04/xenial-security [amd64])
Conf dovecot-imapd (1:2.2.22-1ubuntu2.7 Ubuntu:16.04/xenial-security [amd64])
[1] https://usn.ubuntu.com/3587-1/
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https://bugs.launchpad.net/bugs/1788486
Title:
apt behaviour when package with strict dependencies rules and version
-gt in -updates than -security.
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