UPDATE:
added why-not output as suggested (why output also).
# aptitude why-not libwbclient0
Unable to find a reason to remove libwbclient0.` `why` gives this reasoning.
# aptitude why libwbclient0
i nagios-plugins-standard Recommends smbclient
p smbclient Depends samba-libs (= 2:4.3.11+dfsg-0ubuntu0.14.04.11)
p samba-libs Depends libwbclient0 (>= 2:4.0.3+dfsg1)
Why is aptitude upgrade failing to actually upgrade the package here while apt-get upgrade is willing to perform? As I understand, these two commands should be functionally the same but obviously they disagree. Can anyone explain how to find the problem here and why it works for one command but not the other?
aptitude
# aptitude upgrade
No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 1 not upgraded.
Need to get 0 B of archives. After unpacking 0 B will be used.
apt-get
# apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
The following packages will be upgraded:
libwbclient0
1 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
Need to get 30.0 kB of archives.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n]
