Is there a tool like wifi analyzer for ubuntu?

Network manager command line interface nmcli

nmcli d wifi

This is an output of command:

*  SSID           MODE   CHAN  RATE       SIGNAL  BARS  SECURITY  
   151022         Infra  4     54 Mbit/s  74      ▂▄▆_            
   mary           Infra  4     54 Mbit/s  74      ▂▄▆_  WPA2      
   151022         Infra  40    54 Mbit/s  70      ▂▄▆_            
   mary5          Infra  40    54 Mbit/s  60      ▂▄▆_  WPA2      
   Don Ceci       Infra  6     54 Mbit/s  34      ▂▄__  WPA1 WPA2 
   epg72          Infra  11    54 Mbit/s  34      ▂▄__  WPA1 WPA2 
   Mitio Paynera  Infra  2     54 Mbit/s  24      ▂___  WPA1 WPA2 
   Nina           Infra  1     54 Mbit/s  17      ▂___  WPA1 WPA2 
   Filka          Infra  10    54 Mbit/s  17      ▂___  WPA1      
   Mihaylov       Infra  11    54 Mbit/s  14      ▂___  WPA1 WPA2 
   HomeS2000      Infra  6     54 Mbit/s  7       ▂___  WPA1 WPA2 
   alex1          Infra  7     54 Mbit/s  7       ▂___  WPA1 WPA2 
   epg72          Infra  11    54 Mbit/s  7       ▂___  WPA1 WPA2 
   Valia          Infra  11    54 Mbit/s  7       ▂___  WPA1 WPA2 
   Silviq         Infra  10    54 Mbit/s  4       ____  WPA2      

But you can use:

nmcli -f "CHAN,BARS,SIGNAL,SSID" d wifi list ifname wlx10feed21ae1d  | sort -n

and output will be sorted by channel:

CHAN  BARS  SIGNAL  SSID          
1     ▂___  17      Nina          
2     ____  0       Yankovi       
2     ▂___  24      Mitio Paynera 
3     ____  4       JORODLINK     
4     ▂▄▆_  70      151022        
4     ▂▄▆_  70      mary          
5     ▂___  7       Hristo        
6     ____  0       HomeS2000     
6     ▂___  27      Don Ceci      
6     ____  4       malevi        
6     ____  4       milcho.uzunov 
7     ____  4       alex1         
10    ▂___  10      Filka         
10    ▂___  7       Silviq        
11    ▂___  10      Mihaylov      
11    ▂▄__  34      epg72         
11    ____  4       Valia         
11    ▂___  7       epg72         
40    ▂▄▆_  60      mary5         
40    ▂▄▆_  67      151022        

For continues scan you can combine with command "watch":

watch  "nmcli -f "CHAN,BARS,SIGNAL,SSID" d wifi list ifname wlx10feed21ae1d  | sort -n"

You could use Wavemon. It's available in the Software Center, (or via apt, sudo apt-get install wavemon).

Screenshot from Wavemon's Github (GPLv3).

Once you have installed wavemon, open a terminal (CTRL+ALT+T) and type wavemon.

You could use linssid which offers a nice easy to use GUI for both the 2.4 GHz and 5 GHz channels. http://ubuntuhandbook.org/index.php/2013/08/linssid-wifi-scanner-for-ubuntu-linux-mint/

To install linssid in Ubuntu 16.04 and later type:

sudo apt install linssid