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There are many questions asked in this question. In general, asking only one question in a post is advised to keep it cleaner and simpler. Nevermind.

1. 'PyString_FeomString' was not declared

error: 'PyString_FeomString' was not declared in this scops: did you mean 'PyLong_FeomString'

It seems that the code is edited. Note that the incorrect "PyString_FeomString" (r is replaced by e) by mistake.

• Please correct it and try again.
• As you are using Ubuntu 20.04, I am doubtful about PyString_FromString , because the PyString_FromString doesn't work in Python3.5. The workaround is to use PyUnicode_FromString, which is given here.

2. "rtcm_msgs" not found

Could not find a package configuration file provided by "rtcm_msgs" with any of the following names:

The package ublox/ublox_gps uses rtcm_msgs, which has been mentioned in the CMakeLists.txt file. Furthermore, you are receiving an error because you do not have rtcm_msgs installed in your machine. Please install it using apt as shown below:

sudo apt install ros-noetic-rtcm-msgs

There are many multiple questions asked in this question. In general, asking only one question in a post is advised to keep it cleaner and simpler. Nevermind.

1. 'PyString_FeomString' was not declared

error: 'PyString_FeomString' was not declared in this scops: did you mean 'PyLong_FeomString'

It seems that the code is edited. Note that the incorrect "PyString_FeomString" (r is replaced by e) by mistake.

• Please correct it and try again.
• As you are using Ubuntu 20.04, I am doubtful about PyString_FromString , because the PyString_FromString doesn't work in Python3.5. The workaround is to use PyUnicode_FromString, which is given here.

2. "rtcm_msgs" not found

Could not find a package configuration file provided by "rtcm_msgs" with any of the following names:

The package ublox/ublox_gps uses rtcm_msgs, which has been mentioned in the CMakeLists.txt file. Furthermore, you are receiving an error because you do not have rtcm_msgs installed in your machine. Please install it using apt as shown below:

sudo apt install ros-noetic-rtcm-msgs