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Firefox peut accéder à Internet mais le terminal ne peut pas

Je suis connecté au routeur de l'université et je sais qu'ils ont de nombreuses restrictions, mais firefox accède aux liens de mise en pension sans aucun problème, mais le terminal ne le peut pas.
Comment puis-je faire en sorte que le terminal utilise le même protocole que Firefox?
Ma version Ubuntu est 18.04 LTS
En outre, le gestionnaire de packages logiciels ubuntu semble pouvoir fonctionner, car je pourrais démarrer l’installation de VLC mais je n’ai jamais dépassé les 6-8%, j’obtiens des délais d’attente à chaque fois.
J'ai essayé d'utiliser Synaptic, mais de la même manière.
J’ai essayé d’utiliser les procurations, de connecter ma connexion via ssh à partir de mon téléphone, mais le gestionnaire de paquets (apt ou synaptic) ne passe pas la phase d’authentification.
En outre, je sais que l’université utilise Fortiguard, mais comme je l’ai dit, je peux accéder à tous les dépôts à distance avec Firefox.

wadaane@wadaane-ubuntu:~$ Sudo apt update
Err:1 http://security.ubuntu.com/ubuntu bionic-security InRelease
403  Forbidden [IP: 91.189.91.26 80]
Err:2 http://sy.archive.ubuntu.com/ubuntu bionic InRelease
403  Forbidden [IP: 91.189.88.161 80]
Err:3 http://sy.archive.ubuntu.com/ubuntu bionic-updates InRelease
403  Forbidden [IP: 91.189.88.162 80]
Err:4 http://sy.archive.ubuntu.com/ubuntu bionic-backports InRelease
403  Forbidden [IP: 91.189.88.162 80]
Reading package lists... Done
N: See apt-secure(8) manpage for repository creation and user configuration details.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
E: The repository 'http://security.ubuntu.com/ubuntu bionic-security InRelease' is no longer signed.
E: Failed to fetch http://security.ubuntu.com/ubuntu/dists/bionic-security/InRelease  403  Forbidden [IP: 91.189.91.26 80]
N: See apt-secure(8) manpage for repository creation and user configuration details.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
E: The repository 'http://sy.archive.ubuntu.com/ubuntu bionic InRelease' is not signed.
E: Failed to fetch http://sy.archive.ubuntu.com/ubuntu/dists/bionic/InRelease  403  Forbidden [IP: 91.189.88.161 80]
E: Failed to fetch http://sy.archive.ubuntu.com/ubuntu/dists/bionic-updates/InRelease  403  Forbidden [IP: 91.189.88.162 80]
E: The repository 'http://sy.archive.ubuntu.com/ubuntu bionic-updates InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch http://sy.archive.ubuntu.com/ubuntu/dists/bionic-backports/InRelease  403  Forbidden [IP: 91.189.88.162 80]
E: The repository 'http://sy.archive.ubuntu.com/ubuntu bionic-backports InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

MODIFIER:
Voici la sortie tronquée de tcpdump:

22:15:22.144893 IP wadaane-ubuntu.32779 > 172.18.3.2.domain: 62851+ [1au] PTR? 23.91.189.91.in-addr.arpa. (54)
22:15:22.152815 IP 172.18.3.2.domain > wadaane-ubuntu.32779: 62851 1/0/1 PTR economy.canonical.com. (89)

22:15:22.144309 IP wadaane-ubuntu.36120 > economy.canonical.com.http: Flags [S], seq 704597193, win 29200, options [mss 1460,sackOK,TS val 2654335473 ecr 0,nop,wscale 7], length 0
22:15:22.152697 IP economy.canonical.com.http > wadaane-ubuntu.36120: Flags [S.], seq 2352942977, ack 704597194, win 5792, options [mss 1460,sackOK,TS val 746784843 ecr 2654335473,nop,wscale 7], length 0
22:15:22.152765 IP wadaane-ubuntu.36120 > economy.canonical.com.http: Flags [.], ack 1, win 229, options [nop,nop,TS val 2654335482 ecr 746784843], length
22:15:22.153117 IP wadaane-ubuntu.36120 > economy.canonical.com.http: Flags [P.], seq 1:160, ack 1, win 229, options [nop,nop,TS val 2654335482 ecr 746784843], length 159: HTTP: GET /ubuntu/dists/bionic/InRelease HTTP/1.1
22:15:22.168911 IP economy.canonical.com.http > wadaane-ubuntu.36120: Flags [P.], seq 1:1449, ack 160, win 5792, options [nop,nop,TS val 746784843 ecr 2654335482], length 1448: HTTP: HTTP/1.1 403 Forbidden
22:15:22.168951 IP wadaane-ubuntu.36120 > economy.canonical.com.http: Flags [.], ack 1449, win 251, options [nop,nop,TS val 2654335498 ecr 746784843], length 0
22:15:22.169724 IP wadaane-ubuntu.36120 > economy.canonical.com.http: Flags [F.], seq 160, ack 1449, win 251, options [nop,nop,TS val 2654335499 ecr 746784843], length 0
22:15:22.178134 IP economy.canonical.com.http > wadaane-ubuntu.36120: Flags [P.], seq 1449:2897, ack 160, win 5792, options [nop,nop,TS val 746784843 ecr 2654335482], length 1448: HTTP
22:15:22.178177 IP wadaane-ubuntu.36120 > economy.canonical.com.http: Flags [R], seq 704597353, win 0, length 0
22:15:22.179030 IP economy.canonical.com.http > wadaane-ubuntu.36120: Flags [FP.], seq 2897:2912, ack 160, win 5792, options [nop,nop,TS val 746784843 ecr 2654335482], length 15: HTTP
22:15:22.179049 IP wadaane-ubuntu.36120 > economy.canonical.com.http: Flags [R], seq 704597353, win 0, length 0
22:15:22.185000 IP economy.canonical.com.http > wadaane-ubuntu.36120: Flags [.], ack 161, win 5792, options [nop,nop,TS val 746784843 ecr 2654335499], length 0
22:15:22.185182 IP wadaane-ubuntu.36120 > economy.canonical.com.http: Flags [R], seq 704597354, win 0, length 0
networkingaptfirefoxproxy
1
Wadaane

Ok, donc le problème de réseau ne pouvait pas être résolu, comme la plupart l’ont dit, c’est un problème de département informatique.
La solution finale consiste donc à utiliser apt-offline.

1
Wadaane