apt相關問題

apt找不到key或重複套件，刪掉有問題的apt key

sudo rm /etc/apt/sources.list.d/*cuda*

查看所有可以安裝的版本

apt-cache madison cuda

https://askubuntu.com/questions/447/how-can-i-see-all-versions-of-a-package-that-are-available-in-the-archive

刪除apt key

• 顯示所有key
  apt-key list顯示結果如下

  /etc/apt/trusted.gpg
  --------------------
  pub   rsa4096 2022-05-05 [SCEA]
        8298 D919 610D E70B 90CE  DAAE EE38 2EF7 8230 7095
  uid           [ unknown] TensorRT <svc_tensorrt@nvidia.com>
  
  /etc/apt/trusted.gpg.d/flexiondotorg_ubuntu_nvtop.gpg
  -----------------------------------------------------
  pub   rsa1024 2011-03-16 [SC]
        824A 27DD 09DE DA33 BF78  3596 2EA8 F357 93D8 809A
  uid           [ unknown] Launchpad PPA for Martin Wimpress
  
  /etc/apt/trusted.gpg.d/graphics-drivers_ubuntu_ppa.gpg
  ------------------------------------------------------
  pub   rsa4096 2015-08-12 [SC]
        2388 FF3B E10A 76F6 38F8  0723 FCAE 110B 1118 213C
  uid           [ unknown] Launchpad PPA for Graphics Drivers Team

• 刪掉key
  以下面為例，key ID就是最後8碼82307095，sudo apt-key del 82307095就可以刪除

/etc/apt/trusted.gpg
--------------------
pub   rsa4096 2022-05-05 [SCEA]
      8298 D919 610D E70B 90CE  DAAE EE38 2EF7 8230 7095
uid           [ unknown] TensorRT <svc_tensorrt@nvidia.com>

解決Unmet dependencies問題

• 用dpkg -P package-name來移除有問題的套件，他會顯示不能移除的原因，然後依序移除即可

• 直接用dpkg安裝套件，如果有缺少的相依套件，之後使用apt install就會顯示E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution).錯誤，必須要手動解決相依性問提

apt install使用local repo

參考: https://wiki.debian.org/DebianRepository/Setup?action=show&redirect=DebianRepository%2FHowTo%2FTrivialRepository#trivialArchive

Quick instructions to create a trivial local archive with apt-ftparchive
We use /var/lib/mydebs as the example location

Create the directory

  mkdir -p /var/lib/mydebs
Every time you put new files in the directory, you'll have to scan the directory and update:

  cd /var/lib/mydebs
  apt-ftparchive packages . > Packages
  apt-ftparchive release . > Release
Add this line to /etc/apt/sources.list

  deb [allow-insecure=yes] file:/var/lib/mydebs ./
Now you can install the package normally. If apt-get asks "Install these packages without verification?", answer "Y" to install. That's because this local repository is not signed.

  apt-get update
  apt-get install mydeb

刪除apt gpg key 和repo

https://itslinuxfoss.com/delete-repository-and-gpg-key-ubuntu/#2

查看套件版本

dpkg-query -W tensorrt

用apt 查看可安裝的版本

apt-cache policy <package name>

例如

$ apt-cache policy gparted
gparted:
  Installed: 0.16.1-1
  Candidate: 0.16.1-1
  Version table:
 *** 0.16.1-1 0
        500 http://ubuntu.inode.at/ubuntu/ saucy/main amd64 Packages
        100 /var/lib/dpkg/status

安裝指定版本
sudo apt-get install <package name>=<version>
例如上面的例子

$ sudo apt-get install gparted=0.16.1-1
Reading package lists... Done
Building dependency tree       
Reading state information... Done
gparted is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 265 not upgraded.