7.6. DPKG Queries example "-p"

Using the LFCS Ubuntu 16-04 image when I execute the example "dpkg -p wget" I get:
student@ubuntu:~$ dpkg -p wget dpkg-query: package 'wget' is not available Use dpkg --info (= dpkg-deb --info) to examine archive files, and dpkg --contents (= dpkg-deb --contents) to list their contents.
using "apt-cache show wget" I get the expected result.
Checking in my own installations it looks like there is a difference between 14.04 and 16.04.
Checking man:
-p, --print-avail package-name... Display details about package-name, as found in /var/lib/dpkg/available. Users of APT-based frontends should use apt-cache show package-name instead.
So I can see what is going on, but don't understand it or understand why it is so. Can anyone clarify this for me, please?
Finally, a suggestion to admin to consider this discrepancy and adjust the course material accordingly.
PS. "dpkg -V wget_1.17.1-1ubuntu1_amd64.deb " also fail, I assume for the same reason.
Comments
-
Hi,
This is the key:
dpkg-query: package 'wget' is not available
So, you need to check if 'wget' is installed or not, or broken. So then fix it (do I need to install it?) and try again.
Regards,
Luis.
0 -
Hi Luis,
No, wget is installed. Point is in 16.04 it would seem it is not installed with dpkg but with apt. In that case "-p" won't work, as confirmed in the documentation. "-s" will correctly show installation status as shown below. The course material probably was created with earlier versions and work fine if you do this on e.g. 14.04.
I'd suggest the course material maybe choose another application to demonstrate the "-p". Actually, it may be better this fact is called out in the course so people understand what is going on i.e. "-p" only work if dpkg was used in the first place to install something, which I guess is not many applications nowadays.student@ubuntu:~$ dpkg-query -s wget Package: wget Status: install ok installed
student@ubuntu:~$ dpkg-query -p wget dpkg-query: package 'wget' is not available
0 -
Hi Jengel,
I did the test and I got it, so 'dpkg -p <package_name>' is not working on Ubuntu 16.04, but '-s' is (and it's working on 14.04).
We'll check on this and will let you know.
Thanks for reporting it!
Luis.
0 -
Gald I'm not the only one running into this problem!
0 -
Yeah, some very specific things changes (or even fails) from one distro version to another, so don't worry, we are working on this.
Regards,
Luis.
0
Categories
- All Categories
- 236 LFX Mentorship
- 236 LFX Mentorship: Linux Kernel
- 812 Linux Foundation IT Professional Programs
- 365 Cloud Engineer IT Professional Program
- 183 Advanced Cloud Engineer IT Professional Program
- 82 DevOps Engineer IT Professional Program
- 151 Cloud Native Developer IT Professional Program
- 140 Express Training Courses & Microlearning
- 140 Express Courses - Discussion Forum
- Microlearning - Discussion Forum
- 6.5K Training Courses
- 48 LFC110 Class Forum - Discontinued
- 71 LFC131 Class Forum
- 48 LFD102 Class Forum
- 233 LFD103 Class Forum
- 20 LFD110 Class Forum
- 44 LFD121 Class Forum
- LFD123 Class Forum
- LFD125 Class Forum
- 18 LFD133 Class Forum
- 8 LFD134 Class Forum
- 18 LFD137 Class Forum
- 72 LFD201 Class Forum
- 5 LFD210 Class Forum
- 5 LFD210-CN Class Forum
- 2 LFD213 Class Forum - Discontinued
- 128 LFD232 Class Forum - Discontinued
- 2 LFD233 Class Forum
- 4 LFD237 Class Forum
- 24 LFD254 Class Forum
- 717 LFD259 Class Forum
- 111 LFD272 Class Forum - Discontinued
- 4 LFD272-JP クラス フォーラム
- 13 LFD273 Class Forum
- 210 LFS101 Class Forum
- 1 LFS111 Class Forum
- 3 LFS112 Class Forum
- 3 LFS116 Class Forum
- 7 LFS118 Class Forum
- LFS120 Class Forum
- 9 LFS142 Class Forum
- 8 LFS144 Class Forum
- 4 LFS145 Class Forum
- 3 LFS146 Class Forum
- 15 LFS148 Class Forum
- 15 LFS151 Class Forum
- 5 LFS157 Class Forum
- 49 LFS158 Class Forum
- LFS158-JP クラス フォーラム
- 11 LFS162 Class Forum
- 2 LFS166 Class Forum
- 5 LFS167 Class Forum
- 3 LFS170 Class Forum
- 2 LFS171 Class Forum
- 3 LFS178 Class Forum
- 3 LFS180 Class Forum
- 2 LFS182 Class Forum
- 5 LFS183 Class Forum
- 33 LFS200 Class Forum
- 737 LFS201 Class Forum - Discontinued
- 3 LFS201-JP クラス フォーラム - Discontinued
- 20 LFS203 Class Forum
- 135 LFS207 Class Forum
- 2 LFS207-DE-Klassenforum
- 2 LFS207-JP クラス フォーラム
- 302 LFS211 Class Forum
- 56 LFS216 Class Forum
- 52 LFS241 Class Forum
- 50 LFS242 Class Forum
- 38 LFS243 Class Forum
- 16 LFS244 Class Forum
- 5 LFS245 Class Forum
- LFS246 Class Forum
- LFS248 Class Forum
- 54 LFS250 Class Forum
- 2 LFS250-JP クラス フォーラム
- 1 LFS251 Class Forum
- 156 LFS253 Class Forum
- 1 LFS254 Class Forum
- 1 LFS255 Class Forum
- 12 LFS256 Class Forum
- 1 LFS257 Class Forum
- 1.3K LFS258 Class Forum
- 11 LFS258-JP クラス フォーラム
- 135 LFS260 Class Forum
- 160 LFS261 Class Forum
- 43 LFS262 Class Forum
- 82 LFS263 Class Forum - Discontinued
- 15 LFS264 Class Forum - Discontinued
- 11 LFS266 Class Forum - Discontinued
- 24 LFS267 Class Forum
- 25 LFS268 Class Forum
- 37 LFS269 Class Forum
- 7 LFS270 Class Forum
- 202 LFS272 Class Forum - Discontinued
- 2 LFS272-JP クラス フォーラム
- 4 LFS147 Class Forum
- 2 LFS274 Class Forum
- 4 LFS281 Class Forum
- 15 LFW111 Class Forum
- 262 LFW211 Class Forum
- 185 LFW212 Class Forum
- 15 SKF100 Class Forum
- 1 SKF200 Class Forum
- 2 SKF201 Class Forum
- 797 Hardware
- 199 Drivers
- 68 I/O Devices
- 37 Monitors
- 104 Multimedia
- 174 Networking
- 91 Printers & Scanners
- 85 Storage
- 759 Linux Distributions
- 82 Debian
- 67 Fedora
- 17 Linux Mint
- 13 Mageia
- 23 openSUSE
- 148 Red Hat Enterprise
- 31 Slackware
- 13 SUSE Enterprise
- 354 Ubuntu
- 470 Linux System Administration
- 39 Cloud Computing
- 71 Command Line/Scripting
- Github systems admin projects
- 95 Linux Security
- 78 Network Management
- 102 System Management
- 47 Web Management
- 69 Mobile Computing
- 18 Android
- 38 Development
- 1.2K New to Linux
- 1K Getting Started with Linux
- 378 Off Topic
- 115 Introductions
- 176 Small Talk
- 26 Study Material
- 808 Programming and Development
- 304 Kernel Development
- 486 Software Development
- 1.8K Software
- 263 Applications
- 183 Command Line
- 3 Compiling/Installing
- 988 Games
- 317 Installation
- 103 All In Program
- 103 All In Forum
Upcoming Training
-
August 20, 2018
Kubernetes Administration (LFS458)
-
August 20, 2018
Linux System Administration (LFS301)
-
August 27, 2018
Open Source Virtualization (LFS462)
-
August 27, 2018
Linux Kernel Debugging and Security (LFD440)