mjhjmtu

I want to write an expect script to install and configure Tripwire (open source) on ubuntu (Package name is 'tripwire'). This package presents dialog boxes created with whiptail to configure it.

This is the expect script named tripwire.exp that I wrote

#!/usr/bin/expect

spawn apt-get install -y tripwire

expect -exact "Do you wish to create/use your site key passphrase during installation?"
send ^[[C
send -- "/r"

expect -exact "Do you wish to create/use your local key passphrase during installation?"
send ^[[C
send -- "/r"

expect -exact "Tripwire has been installed"
send -- "/r"

When I execute this using sudo expect tripwire.exp, I am presented with the first whiptail dialog box in the tripwire configuration. After a few seconds my terminal prompt appears as <ubuntu@Tripwire2:~$ in the middle of the terminal with < highlighted in red. However there are no errors. But when I check if the package has been installed, it hasn't.

I then executed it in debug mode with sudo expect -d tripwire.exp and this is the output I got

spawn apt-get install -y tripwire^M
^MReading package lists... 0%^M^MReading package lists... 100%^M^MReading package lists... Done^M^M
^MBuilding dependency tree... 0%^M^MBuilding dependency tree... 0%^M^MBuilding dependency tree... 50%^M^MBuilding dependency tree... 50%^M^MBuilding dependency tree ^M^M
^MReading state information... 0%^M^MReading state information... 1%^M^MReading state information... Done^M^M
The following NEW packages will be installed:^M
 tripwire^M
0 upgraded, 1 newly installed, 0 to remove and 18 not upgraded.^M
Need to get 0 B/1,474 kB of archives.^M
After this operation, 11.1 MB of additional disk space will be used.^M
Preconfiguring packages ...^M
^[[?1049h^[[1;48r^[[4l^[[?25l^[(B^[[m^[[37m^[[40m^[[1;48r^[[H^[[2J^[[1;1H^[[97m^[[45m^[[K
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^[[K^[[1;1H^[[37mPackage configuration^[[13;2H^[[30m^[[47m┌────────────────────────┤ ^[[31mTripwire Configuration^[[30m ├─────────────────────────┐^[[14;2H│ │^[[97m^[[40m ^[[15;2H^[[30m^[[47m│ Tripwire uses a pair of keys to sign various files, thus ensuring their │^[[97m^[[40m ^[[16;2H^[[30m^[[47m│ unaltered state. By accepting here, you will be prompted for the │^[[97m^[[40m ^[[17;2H^[[30m^[[47m│ passphrase for the first of those keys, the site key, during the │^[[97m^[[40m ^[[18;2H^[[30m^[[47m│ installation. You are also agreeing to create a site key if one doesn't │^[[97m^[[40m ^[[19;2H^[[30m^[[47m│ exist already. Tripwire uses the site key to sign files that may be │^[[97m^[[40m ^[[20;2H^[[30m^[[47m│ common to multiple systems, e.g. the configuration & policy files. See │^[[97m^[[40m ^[[21;2H^[[30m^[[47m│ twfiles(5) for more information. │^[[97m^[[40m ^[[22;2H^[[30m^[[47m│ │^[[97m^[[40m ^[[23;2H^[[30m^[[47m│ Unfortunately, due to the Debian installation process, there is a period │^[[97m^[[40m ^[[24;2H^[[30m^[[47m│ of time where this passphrase exists in a unencrypted format. Were an │^[[97m^[[40m ^[[25;2H^[[30m^[[47m│ attacker to have access to your machine during this period, he could │^[[97m^[[40m ^[[26;2H^[[30m^[[47m│ possibly retrieve your passphrase and use it at some later point. │^[[97m^[[40m ^[[27;2H^[[30m^[[47m│ │^[[97m^[[40m ^[[28;2H^[[30m^[[47m│ If you would rather not have this exposure, decline here. You will then │^[[97m^[[40m ^[[29;2H^[[30m^[[47m│ need to create a site key, configuration file & policy file by hand. │^[[97m^[[40m ^[[30;2H^[[30m^[[47m│ See twadmin(8) for more information. │^[[97m^[[40m ^[[31;2H^[[30m^[[47m│ │^[[97m^[[40m ^[[32;2H^[[30m^[[47m│ Do you wish to create/use your site key passphrase during installation? │^[[97m^[[40m ^[[33;2H^[[30m^[[47m│ │^[[97m^[[40m ^[[34;2H^[[30m^[[47m│ ^[[37m^[[41m<Yes>^[[30m^[[47m <No> │^[[97m^[[40m ^[[35;2H^[[30m^[[47m│ │^[[97m^[[40m ^[[36;2H^[[30m^[[47m└───────────────────────────────────────────────────────────────────────────┘^[[97m^[[40m ^[[37;3H ^[[34;24H

What should I do to get my script working?