Linux Mint - why is the Internet speed so slow and it's impossible to install programs?

Question

linux

Hello.
1. The download speed of any file in any browser does not exceed 50-100 Kb/sec. Transmission downloads a maximum of 500 KB / sec, although in Windows everything was fine 5-6 MB / sec.
2. when trying to install a .deb package downloaded from the Internet (for example, chrome, teamviewer), a double-click message appears "Only one software management tool is allowed to run at the same time. Please close the other application eg 'Update Manager', 'aptitude 'or 'Synaptic' first. I disabled Update Manger, which hung in the tray, it did not help. I did not find the programs I needed in the "Program Manager".
I would be grateful for your help.
linux mint 17 cinnamon 32bit 2.2.13 / 3.13.0-24 -generic
add - Internet wired 100Mbps.

Answer 1

On the first point:
1. Try to disable iptables for testing
2. Is the machine physical or virtual and is it behind managed l2/l3 routers?
3. Compare the size of tcp_window in packages on linux and windows. I had this situation at work:
2 providers, on our cisco side, on their junipers. On the vpn tunnel, the tunnel speed (iperf) dropped by half. It turned out that the problem was in the reduced size of the tcp window on the provider's side
. According to the second:
Yandex's first answer:
www.linuxquestions.org/questions/linux-software-2/...

Answer 2

You have been answered on the first point.
According to the second - as you understand, only one package management system can be running at one time. Leave all terminal sessions where apt was running, don't run synaptic or update manager - and you should be able to install.
And one more thing: "double click" launches gdebi ?
You can also install the .deb package from the console using the deb command

Answer 3

The problem with the installer was solved by itself, it seems after the next update.
I'll fix the problems with speed tomorrow. Thanks for answers.