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Distinction between apt-cache and dpkg -l

using apt-cache searchsuccessful installing packages but dpkg has errorhow to install packages which is not in the cache with pythonCan't Update or Upgrade 'dpkg returned with error code (2)'apt-cache unmet shows non-existent packagesschroot and apt-getConfigure APT to also cache all dependencies of a package?dpkg and 50unattended-upgrades.ucftmp issueproblem with apt and dbkg18.04.1 Server keeps creating /var/lib/dpkg/lock and /var/cache/apt/archives/lock. What now?

2

1

I use apt-cache pkgname to retrieve the packages as

me@host:~$ apt-cache pkgnames | wc -l

62803

get 62803 results

but

me@host:~$ dpkg -l | wc -l

2336

What's the reasons which lead such a huge distinction. I presume that dpkg is super than apt.

package-management

share|improve this question

asked 1 hour ago

AliceAlice

443110

add a comment | 

2

1

I use apt-cache pkgname to retrieve the packages as

me@host:~$ apt-cache pkgnames | wc -l

62803

get 62803 results

but

me@host:~$ dpkg -l | wc -l

2336

What's the reasons which lead such a huge distinction. I presume that dpkg is super than apt.

package-management

share|improve this question

asked 1 hour ago

AliceAlice

443110

add a comment | 

I use apt-cache pkgname to retrieve the packages as

me@host:~$ apt-cache pkgnames | wc -l

62803

get 62803 results

but

me@host:~$ dpkg -l | wc -l

2336

What's the reasons which lead such a huge distinction. I presume that dpkg is super than apt.

package-management

share|improve this question

asked 1 hour ago

AliceAlice

443110

me@host:~$ apt-cache pkgnames | wc -l

62803

me@host:~$ dpkg -l | wc -l

2336

share|improve this question

asked 1 hour ago

AliceAlice

443110

share|improve this question

asked 1 hour ago

AliceAlice

443110

asked 1 hour ago

AliceAlice

443110

asked 1 hour ago

AliceAlice

443110

1 Answer
1

active

oldest

votes

2

apt is for managing remote repositories, dpkg - for locally installed packages. They're related. apt is front end to dpkg. When you run apt-get install package it gets .deb file, and installs it via dpkg. So numbers differ because there's a lot of packages available, but only fraction is installed locally on your system.

apt-cache can show both installed and non-installed packages, because it queries the apt cache - listing of what is available in remote repositories ( that cache is what you get when you do apt-get update). For instance,

$ apt-cache policy terminator

terminator:

  Installed: (none)

  Candidate: 1.91-1





$ dpkg -l terminator

dpkg-query: no packages found matching terminator

share|improve this answer

edited 26 mins ago

answered 35 mins ago

Sergiy KolodyazhnyySergiy Kolodyazhnyy

73.9k9154323

add a comment | 

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2

apt is for managing remote repositories, dpkg - for locally installed packages. They're related. apt is front end to dpkg. When you run apt-get install package it gets .deb file, and installs it via dpkg. So numbers differ because there's a lot of packages available, but only fraction is installed locally on your system.

apt-cache can show both installed and non-installed packages, because it queries the apt cache - listing of what is available in remote repositories ( that cache is what you get when you do apt-get update). For instance,

$ apt-cache policy terminator

terminator:

  Installed: (none)

  Candidate: 1.91-1





$ dpkg -l terminator

dpkg-query: no packages found matching terminator

share|improve this answer

edited 26 mins ago

answered 35 mins ago

Sergiy KolodyazhnyySergiy Kolodyazhnyy

73.9k9154323

add a comment | 

2

apt is for managing remote repositories, dpkg - for locally installed packages. They're related. apt is front end to dpkg. When you run apt-get install package it gets .deb file, and installs it via dpkg. So numbers differ because there's a lot of packages available, but only fraction is installed locally on your system.

apt-cache can show both installed and non-installed packages, because it queries the apt cache - listing of what is available in remote repositories ( that cache is what you get when you do apt-get update). For instance,

$ apt-cache policy terminator

terminator:

  Installed: (none)

  Candidate: 1.91-1





$ dpkg -l terminator

dpkg-query: no packages found matching terminator

share|improve this answer

edited 26 mins ago

answered 35 mins ago

Sergiy KolodyazhnyySergiy Kolodyazhnyy

73.9k9154323

add a comment | 

apt is for managing remote repositories, dpkg - for locally installed packages. They're related. apt is front end to dpkg. When you run apt-get install package it gets .deb file, and installs it via dpkg. So numbers differ because there's a lot of packages available, but only fraction is installed locally on your system.

apt-cache can show both installed and non-installed packages, because it queries the apt cache - listing of what is available in remote repositories ( that cache is what you get when you do apt-get update). For instance,

$ apt-cache policy terminator

terminator:

  Installed: (none)

  Candidate: 1.91-1





$ dpkg -l terminator

dpkg-query: no packages found matching terminator

share|improve this answer

edited 26 mins ago

answered 35 mins ago

Sergiy KolodyazhnyySergiy Kolodyazhnyy

73.9k9154323

$ apt-cache policy terminator

terminator:

  Installed: (none)

  Candidate: 1.91-1





$ dpkg -l terminator

dpkg-query: no packages found matching terminator

share|improve this answer

edited 26 mins ago

answered 35 mins ago

Sergiy KolodyazhnyySergiy Kolodyazhnyy

73.9k9154323

answered 35 mins ago

Sergiy KolodyazhnyySergiy Kolodyazhnyy

73.9k9154323

answered 35 mins ago

Sergiy KolodyazhnyySergiy Kolodyazhnyy

73.9k9154323