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I was wondering for a long time why sudo apt fails to install local deb from some folders with error:

Failed to fetch a file... Permission denied 

Recently I've tried sudo dpkg -i same path and it worked. The path is on USB mounted with udisks, so it is inside a /media/user folder and as of now my guess it is due to ACL on that folder (drwxr-x---+). But why a command with sudo gets permission denied? Why then other command on same files works fine?

I would use dpkg but it does not process pre-dependencies in proper order as opposed to apt.

Is there any way to skip fetching part for apt? Before fetching, near start of output apt gives Note selecting abc instead of abc.20-2-a.deb. Is there a way to make apt process particular deb files, not to try to locate others?

P.S. I'm aware of other ways to install local debs, e.g. adding local repository or using non-preinstalled apt-offline from How to install packages without internet , but I'd like to keep things simple (plus I suspect local repository way could face same permission denied issue).

Added 2:

sudo mount rd -t tmpfs /media/mint/rd -o x-mount.mkdir
sudo mount ram -t tmpfs /media/ram -o x-mount.mkdir

apt from rd fails, apt from ram works fine, so I guess the problem is in mint ACL, I've tried to show it below, I do not understand ACL on Linux much. Inserted USB drives are mounted under user's mint (liveUSB user), so I want to tackle it. When I sudo -i and get root command prompt then I could manually mkdir, mv withing rd, also sudo touch /media/mint/rd/mpv/1 created a file, so why sudo apt fails?

Added:

permissions inc. ACL:

mint@mint:~$ ls -la /media/mint/rd
total 0
drwxrwxrwt  4 root root 80 Oct 24 03:23 .
drwxr-xrw-+ 4 root root 80 Oct 24 03:22 ..
drwxrwxrwx  2 mint mint 80 Oct 12 23:01 ffmpeg
drwxrwxrwx  2 mint mint 60 Oct 11 17:53 mpv

ACL:
mint@mint:~$ getfacl /media/mint/
getfacl: Removing leading '/' from absolute path names
# file: media/mint/
# owner: root
# group: root
user::rwx
user:mint:r-x
group::---
mask::r-x
other::rw-

apt / apt-get output:

mint@mint:~$ sudo apt install -d /media/mint/rd/ffmpeg/*.deb
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Note, selecting 'ffmpeg' instead of '/media/mint/rd/ffmpeg/ffmpeg_7%3a4.2.4-1ubuntu0.1_amd64.deb'
Note, selecting 'libavresample4' instead of '/media/mint/rd/ffmpeg/libavresample4_7%3a4.2.4-1ubuntu0.1_amd64.deb'
Suggested packages:
  ffmpeg-doc
The following NEW packages will be installed:
  ffmpeg libavresample4
0 upgraded, 2 newly installed, 0 to remove and 71 not upgraded.
Need to get 1507 kB of archives.
After this operation, 2275 kB of additional disk space will be used.
Ign:1 http://archive.ubuntu.com/ubuntu focal-updates/universe amd64 libavresample4 amd64 7:4.2.4-1ubuntu0.1
Ign:2 http://archive.ubuntu.com/ubuntu focal-updates/universe amd64 ffmpeg amd64 7:4.2.4-1ubuntu0.1
Ign:1 http://security.ubuntu.com/ubuntu focal-updates/universe amd64 libavresample4 amd64 7:4.2.4-1ubuntu0.1
Ign:2 http://security.ubuntu.com/ubuntu focal-updates/universe amd64 ffmpeg amd64 7:4.2.4-1ubuntu0.1
Get:1 http://security.ubuntu.com/ubuntu focal-updates/universe amd64 libavresample4 amd64 7:4.2.4-1ubuntu0.1 [54.2 kB]
Err:1 http://security.ubuntu.com/ubuntu focal-updates/universe amd64 libavresample4 amd64 7:4.2.4-1ubuntu0.1
  File not found - /media/mint/rd/ffmpeg/libavresample4_70x0.07ffe00000006p-10224.2.4-1ubuntu0.1_amd64.deb (13: Permission denied)
Get:2 http://security.ubuntu.com/ubuntu focal-updates/universe amd64 ffmpeg amd64 7:4.2.4-1ubuntu0.1 [1453 kB]
Err:2 http://security.ubuntu.com/ubuntu focal-updates/universe amd64 ffmpeg amd64 7:4.2.4-1ubuntu0.1
  File not found - /media/mint/rd/ffmpeg/ffmpeg_70x0.07ffe00000002p-10224.2.4-1ubuntu0.1_amd64.deb (13: Permission denied)
E: Failed to fetch file:/media/mint/rd/ffmpeg/libavresample4_7%3a4.2.4-1ubuntu0.1_amd64.deb  File not found - /media/mint/rd/ffmpeg/libavresample4_70x0.07ffe00000006p-10224.2.4-1ubuntu0.1_amd64.deb (13: Permission denied)
E: Failed to fetch file:/media/mint/rd/ffmpeg/ffmpeg_7%3a4.2.4-1ubuntu0.1_amd64.deb  File not found - /media/mint/rd/ffmpeg/ffmpeg_70x0.07ffe00000002p-10224.2.4-1ubuntu0.1_amd64.deb (13: Permission denied)
E: Some files failed to download
mint@mint:~$ sudo apt-get install -d /media/mint/rd/ffmpeg/*.deb
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Note, selecting 'ffmpeg' instead of '/media/mint/rd/ffmpeg/ffmpeg_7%3a4.2.4-1ubuntu0.1_amd64.deb'
Note, selecting 'libavresample4' instead of '/media/mint/rd/ffmpeg/libavresample4_7%3a4.2.4-1ubuntu0.1_amd64.deb'
Suggested packages:
  ffmpeg-doc
The following NEW packages will be installed:
  ffmpeg libavresample4
0 upgraded, 2 newly installed, 0 to remove and 71 not upgraded.
Need to get 1507 kB of archives.
After this operation, 2275 kB of additional disk space will be used.
Ign:1 http://archive.ubuntu.com/ubuntu focal-updates/universe amd64 libavresample4 amd64 7:4.2.4-1ubuntu0.1
Ign:2 http://archive.ubuntu.com/ubuntu focal-updates/universe amd64 ffmpeg amd64 7:4.2.4-1ubuntu0.1
Ign:1 http://security.ubuntu.com/ubuntu focal-updates/universe amd64 libavresample4 amd64 7:4.2.4-1ubuntu0.1
Ign:2 http://security.ubuntu.com/ubuntu focal-updates/universe amd64 ffmpeg amd64 7:4.2.4-1ubuntu0.1
Get:1 http://security.ubuntu.com/ubuntu focal-updates/universe amd64 libavresample4 amd64 7:4.2.4-1ubuntu0.1 [54.2 kB]
Err:1 http://security.ubuntu.com/ubuntu focal-updates/universe amd64 libavresample4 amd64 7:4.2.4-1ubuntu0.1
  File not found - /media/mint/rd/ffmpeg/libavresample4_70x0.07fff00000006p-10224.2.4-1ubuntu0.1_amd64.deb (13: Permission denied)
Get:2 http://security.ubuntu.com/ubuntu focal-updates/universe amd64 ffmpeg amd64 7:4.2.4-1ubuntu0.1 [1453 kB]
Err:2 http://security.ubuntu.com/ubuntu focal-updates/universe amd64 ffmpeg amd64 7:4.2.4-1ubuntu0.1
  File not found - /media/mint/rd/ffmpeg/ffmpeg_70x0.07fff00000002p-10224.2.4-1ubuntu0.1_amd64.deb (13: Permission denied)
E: Failed to fetch file:/media/mint/rd/ffmpeg/libavresample4_7%3a4.2.4-1ubuntu0.1_amd64.deb  File not found - /media/mint/rd/ffmpeg/libavresample4_70x0.07fff00000006p-10224.2.4-1ubuntu0.1_amd64.deb (13: Permission denied)
E: Failed to fetch file:/media/mint/rd/ffmpeg/ffmpeg_7%3a4.2.4-1ubuntu0.1_amd64.deb  File not found - /media/mint/rd/ffmpeg/ffmpeg_70x0.07fff00000002p-10224.2.4-1ubuntu0.1_amd64.deb (13: Permission denied)
E: Some files failed to download
0

1 Answer 1

2

As I've understood now (thanks to the comments) sudo apt uses _apt user. And absence of execute permission for parent folder /media/mint prevented it from accessing the files. The workaround is to add exec permission, e.g.

setfacl -m u:_apt:x /media/mint

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