Get Chromium On Ubuntu 20.04 WITHOUT SNAP!

Question

I'm new to python and I need to plot graphs for my university courses. I get a value error on this code and I don't know how to solve it. I have tried to convert V and m with np.asscalar but I don't get any improvements.

ValueError: err must be a scalar or a 1D or (2, n) array-like

I think the problem is in the errorbar but I really am struggling with it.

import numpy as np
from matplotlib import pyplot as plt
from scipy.optimize import curve_fit

m=np.array([np.loadtxt('masse.txt')]) 
sigma_m=np.array([np.loadtxt('errore_masse.txt')])
lati=np.array([np.loadtxt('lati.txt')])
sigma_lati=np.array(np.loadtxt('errore_lati.txt'))
h=np.array([np.loadtxt('altezze.txt')]) 
sigma_h=np.array([np.loadtxt('errore_altezza.txt')])

dc=np.array([6.45, 8.56, 10.45, 10.46])
hc=np.array([16.25, 40.80, 75., 17.67])
lpe=np.array([8.56])
a=np.array([7.41])
hpe=np.array([37.3])
lb=np.array([10.46])

rc=dc/2
Vc=2*np.pi*a**2 *hc
sigma_rc=sigma_lati/2
sigma_Vc=Vc*2*(0.01/dc)

Vpe=6*lpe*a*hpe
sigma_Vpe=((lpe*a)**2 *(0.01)**2 +(lpe*hpe)**2 *(0.01)**2 +(hpe*a)**2 *(0.01)**2)

Vp=lb**2
sigma_Vp=2*Vp*(0.01/lb)

V=np.array([np.loadtxt('volumi.txt')])
sigma_V=np.array([np.loadtxt('errore_volumi.txt')])

def line (x, a, q):
    """funzione retta
    """
    return a*x+q

plt.figure('Grafico massa-volume oggetti di ottone')
plt.errorbar(m, sigma_m, V, sigma_V, marker='.', fmt='.')

popt, pcov=curve_fit(m, V, line)

a_fit, q_fit= popt

sigma_a_fit, sigma_q_fit=np.sqrt(pcov.diagonal())

print(a_fit, q_fit, sigma_a_fit, sigma_q_fit)
x=np.linspace(10.675, 34.080, 10)
plt.plot(x, line(x, a_fit, q_fit))
plt.xlabel('Volume [mm$^3$]')
plt.ylabel('Massa [g]')
plt.grid (ls='dashed', which='both')

plt.show()

Solution

Part One: Download Available Dependencies.

1. Download these:

sudo apt install libgcc1 libmpx2 gcc-8-base

Part Two: Get .deb files of Chromium

1. Install VirtualBox
2. Run Ubuntu 18.04 in it
3. Download Chromium (and dependencies) with download-only flag

sudo apt-get --download-only install chromium-browser chromium-browser-l10n chromium-codecs-ffmpeg-extra

4. Go to /var/cache/apt/archives and the .deb files will be there.
5. Copy the deb files into a shared folder between the guest and the host OS.
6. Download and install the packages.

Part 3: Disable Updates in Update Manager or other Update Software

1. Running

sudo apt-mark hold chromium-browser

will disable the Updates. You will only be able to install them manually.(From new .deb packages from 18.04).

Comments

[David K]

When I look up pyplot.errorbar the parameter list doesn't match the parameters you passed: matplotlib.org/3.1.1/api/_as_gen/… -- what version are you using?

[Admin]

There are clear directions here, not worthy of really typing an answer as it's pretty straight forward: fosspost.org/tutorials/chromium-deb-package-ubuntu-20-04

[Admin]

This might be a duplicate to askubuntu.com/questions/1204571/chromium-without-snap

[lore_caram]

i checked and the shape of all four parameters in the errorbar is (1, 5), i also tried to put xerr and yerr but nothing has changed. should i try to change the shape of the parameters?

[BenT]

Thats part of your error, you need to have a 1D array not 2D. You can remove the 1 by indexing the values like m[0], V[0] and so on

[BenT]

You are welcome, consider upvoting or marking the question as answered so others can benefit.

[Mikel]

This seems overly complicated. And you won't get security updates.

[TheAlphaReturns]

Only Chromium is going to be on pause. You can get .deb's from 18.04 to update it manually. If you update it from here, it will install as a snap.

[Mikel]

Did you already read askubuntu.com/questions/1204571/chromium-without-snap ? That approach seems simpler and more secure to me

[Melroy van den Berg]

No Freaking way.. people. This is not the way to use a browser. Just download if from the Debian repo.