apt-offline get : IndexError: list index out of range

Question

I'm trying to upgrade a computer under Ubuntu 16 without internet from another computer under Ubuntu 18. Under the Ubuntu16 computer I did:

$ sudo apt-offline set ~/offline-data.sig

Then I switched to my Ubuntu18 with the .sig file and tried using apt-offline but got this error when trying to download the packages:

$ apt-offline get -d ./OfflineUpgrade/ offline-data.sig
Fetching APT Data
Traceback (most recent call last):
  File "/usr/bin/apt-offline", line 28, in <module>
    main()
  File "/usr/lib/python3/dist-packages/apt_offline_core/AptOfflineCoreLib.py", line 2211, in main
    args.func(args)
  File "/usr/lib/python3/dist-packages/apt_offline_core/AptOfflineCoreLib.py", line 1135, in fetcher
    (ItemURL, ItemFile, ItemSize, ItemChecksum) = stripper(item)
  File "/usr/lib/python3/dist-packages/apt_offline_core/AptOfflineCoreLib.py", line 814, in stripper
    item1 = ''.join(item[1])
IndexError: list index out of range

My offline-data.sig looks like this:

'https://esm.ubuntu.com/infra/ubuntu/dists/xenial-infra-security/InRelease' esm.ubuntu.com_infra_ubuntu_dists_xenial-infra-security_InRelease 0 
'https://esm.ubuntu.com/infra/ubuntu/dists/xenial-infra-security/main/binary-amd64/Packages.xz' esm.ubuntu.com_infra_ubuntu_dists_xenial-infra-security_main_binary-amd64_Packages 0 
'https://esm.ubuntu.com/infra/ubuntu/dists/xenial-infra-security/main/binary-i386/Packages.xz' esm.ubuntu.com_infra_ubuntu_dists_xenial-infra-security_main_binary-i386_Packages 0 
'https://esm.ubuntu.com/infra/ubuntu/dists/xenial-infra-security/main/binary-all/Packages.xz' esm.ubuntu.com_infra_ubuntu_dists_xenial-infra-security_main_binary-all_Packages 0 
'https://esm.ubuntu.com/infra/ubuntu/dists/xenial-infra-security/main/i18n/Translation-fr_FR.xz' esm.ubuntu.com_infra_ubuntu_dists_xenial-infra-security_main_i18n_Translation-fr%5fFR 0 
'https://esm.ubuntu.com/infra/ubuntu/dists/xenial-infra-security/main/i18n/Translation-fr.xz' esm.ubuntu.com_infra_ubuntu_dists_xenial-infra-security_main_i18n_Translation-fr 0 
'https://esm.ubuntu.com/infra/ubuntu/dists/xenial-infra-security/main/i18n/Translation-en.xz' esm.ubuntu.com_infra_ubuntu_dists_xenial-infra-security_main_i18n_Translation-en 0 
'https://esm.ubuntu.com/infra/ubuntu/dists/xenial-infra-security/main/dep11/Components-amd64.yml.xz' esm.ubuntu.com_infra_ubuntu_dists_xenial-infra-security_main_dep11_Components-amd64.yml 0

How can I solve this?

Please don't post images of text.

Eduardo Trápani
– Eduardo Trápani

2021-05-31 11:40:04 +00:00
Commented May 31, 2021 at 11:40 — Eduardo Trápani
– Eduardo Trápani, Commented May 31, 2021 at 11:40

Argent · Accepted Answer · 2021-05-31 13:04:54Z

So, the problem came from different writing of the .sig file by apt-offline. In my Ubuntu 16 which wrote it, the file ended with several lines of blank text:

'http://fr.archive.ubuntu.com/ubuntu/dists/xenial-backports/multiverse/dep11/icons-64x64.tar.xz' fr.archive.ubuntu.com_ubuntu_dists_xenial-backports_multiverse_dep11_icons-64x64.tar 0 

Enable UA Infra: ESM to receive additional future security updates.

See https://ubuntu.com/esm or run: sudo ua status

while the Ubuntu 18 that read it finished with full lines:

'http://at.archive.ubuntu.com/ubuntu/pool/main/i/initramfs-tools/initramfs-tools-bin_0.130ubuntu3.12_amd64.deb' initramfs-tools-bin_0.130ubuntu3.12_amd64.deb 11156 MD5Sum:43c52cbf0447849d6997b454b4fc8d8d

So erasing the last lines did the trick.

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